diff --git a/src/IharBury.Expressions/BooleanExpressions.cs b/src/IharBury.Expressions/BooleanExpressions.cs
index 2955e73..14eb4f2 100644
--- a/src/IharBury.Expressions/BooleanExpressions.cs
+++ b/src/IharBury.Expressions/BooleanExpressions.cs
@@ -607,7 +607,7 @@ private static LambdaExpression Combine(
 
             LambdaExpression firstExpression = null;
             Expression resultBody = null;
-            IReadOnlyList<ParameterExpression> resultParameters = null;
+            IList<ParameterExpression> resultParameters = null;
             foreach (var expression in expressions)
             {
                 if (expression == null)
diff --git a/src/IharBury.Expressions/CompatibilityExtensions.cs b/src/IharBury.Expressions/CompatibilityExtensions.cs
new file mode 100644
index 0000000..6b61190
--- /dev/null
+++ b/src/IharBury.Expressions/CompatibilityExtensions.cs
@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace IharBury.Expressions
+{
+    internal static class CompatibilityExtensions
+    {
+        internal static Type GetBaseType(this Type type)
+        {
+            if (type == null)
+                throw new ArgumentNullException(nameof(type));
+
+#if NET40
+            return type.BaseType;
+#else
+            return type.GetTypeInfo().BaseType;
+#endif
+        }
+
+        internal static IEnumerable<PropertyInfo> GetDeclaredProperties(this Type type)
+        {
+            if (type == null)
+                throw new ArgumentNullException(nameof(type));
+
+#if NET40
+            return (IEnumerable<PropertyInfo>)type.GetProperties(BindingFlags.DeclaredOnly | 
+                BindingFlags.Instance | 
+                BindingFlags.Static | 
+                BindingFlags.Public | 
+                BindingFlags.NonPublic);
+#else
+            return type.GetTypeInfo().DeclaredProperties;
+#endif
+        }
+
+        internal static bool GetIsConstructedGenericType(this Type type)
+        {
+            if (type == null)
+                throw new ArgumentNullException(nameof(type));
+
+#if NET40
+            return type.IsGenericType && !type.IsGenericTypeDefinition;
+#else
+            return type.IsConstructedGenericType;
+#endif
+        }
+    }
+}
diff --git a/src/IharBury.Expressions/ExpressionExpander.cs b/src/IharBury.Expressions/ExpressionExpander.cs
index b3bbe48..87d7a63 100644
--- a/src/IharBury.Expressions/ExpressionExpander.cs
+++ b/src/IharBury.Expressions/ExpressionExpander.cs
@@ -8,14 +8,18 @@ namespace IharBury.Expressions
 {
     internal sealed class ExpressionExpander : ExpressionVisitor
     {
-        private static readonly MethodInfo MethodInfoCreateDelegateMethod =
-            ReflectionExpressions.GetMethodInfo<MethodInfo>(methodInfo =>
-                methodInfo.CreateDelegate(default(Type), default(object)));
-
+        private static readonly MethodInfo MethodInfoCreateDelegateMethod;
         private static readonly MethodInfo DelegateCreateDelegateMethod;
 
         static ExpressionExpander()
         {
+            MethodInfoCreateDelegateMethod = typeof(MethodInfo).GetMethod(
+                "CreateDelegate",
+                new[]
+                {
+                    typeof(Type),
+                    typeof(object)
+                });
             DelegateCreateDelegateMethod = typeof(Delegate).GetMethod(
                 "CreateDelegate",
                 new[]
@@ -65,7 +69,7 @@ private static bool IsCompileMethod(MethodInfo method)
                 throw new ArgumentNullException(nameof(method));
 
             return (method.DeclaringType != null) &&
-                method.DeclaringType.IsConstructedGenericType &&
+                method.DeclaringType.GetIsConstructedGenericType() &&
                 (method.DeclaringType.GetGenericTypeDefinition() == typeof(Expression<>)) &&
                 (method.Name == nameof(Expression<Func<object>>.Compile));
         }
@@ -104,7 +108,7 @@ protected override Expression VisitMethodCall(MethodCallExpression node)
             }
 
             if ((baseResult.Method.DeclaringType != null) &&
-                (baseResult.Method.DeclaringType.GetTypeInfo().BaseType == typeof(MulticastDelegate)) &&
+                (baseResult.Method.DeclaringType.GetBaseType() == typeof(MulticastDelegate)) &&
                 (baseResult.Method.Name == nameof(Action.Invoke)) &&
                 (baseResult.Object != null) &&
                 (baseResult.Object.NodeType == ExpressionType.Call))
@@ -173,7 +177,7 @@ protected override Expression VisitUnary(UnaryExpression node)
 
         private bool TrySubstituteExpression(
             Expression expressionExpression,
-            IReadOnlyList<Expression> arguments,
+            IList<Expression> arguments,
             out Expression result)
         {
             if (expressionExpression == null)
diff --git a/src/IharBury.Expressions/Extensions.cs b/src/IharBury.Expressions/Extensions.cs
index 08be479..bc6e6d9 100644
--- a/src/IharBury.Expressions/Extensions.cs
+++ b/src/IharBury.Expressions/Extensions.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
+using System.Reflection;
 
 namespace IharBury.Expressions
 {
diff --git a/src/IharBury.Expressions/ReflectionExpressions.cs b/src/IharBury.Expressions/ReflectionExpressions.cs
index d6456c0..49d3ff0 100644
--- a/src/IharBury.Expressions/ReflectionExpressions.cs
+++ b/src/IharBury.Expressions/ReflectionExpressions.cs
@@ -325,8 +325,8 @@ public static PropertyInfo TryGetPropertyInfo(LambdaExpression propertyExpressio
                         return methodCallExpression
                             .Method
                             .DeclaringType
-                            .GetTypeInfo()
-                            .DeclaredProperties.SingleOrDefault(property => property.GetMethod == methodCallExpression.Method);
+                            .GetDeclaredProperties()
+                            .SingleOrDefault(property => property.GetGetMethod() == methodCallExpression.Method);
                     return null;
 
                 default:
diff --git a/src/IharBury.Expressions/project.json b/src/IharBury.Expressions/project.json
index 6722104..a274a54 100644
--- a/src/IharBury.Expressions/project.json
+++ b/src/IharBury.Expressions/project.json
@@ -17,6 +17,7 @@
         "System.Linq.Expressions": "4.0.10-*"
       }
     },
-    "net45": { }
+    "net45": { },
+    "net40": { }
   }
 }
diff --git a/test/IharBury.Expressions.Tests/CompatibilityExtensions.cs b/test/IharBury.Expressions.Tests/CompatibilityExtensions.cs
new file mode 100644
index 0000000..7f77c41
--- /dev/null
+++ b/test/IharBury.Expressions.Tests/CompatibilityExtensions.cs
@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace IharBury.Expressions.Tests
+{
+    internal static class CompatibilityExtensions
+    {
+        internal static Type GetBaseType(this Type type)
+        {
+            if (type == null)
+                throw new ArgumentNullException(nameof(type));
+
+#if NET40
+            return type.BaseType;
+#else
+            return type.GetTypeInfo().BaseType;
+#endif
+        }
+
+        internal static IEnumerable<PropertyInfo> GetDeclaredProperties(this Type type)
+        {
+            if (type == null)
+                throw new ArgumentNullException(nameof(type));
+
+#if NET40
+            return (IEnumerable<PropertyInfo>)type.GetProperties(BindingFlags.DeclaredOnly | 
+                BindingFlags.Instance | 
+                BindingFlags.Static | 
+                BindingFlags.Public | 
+                BindingFlags.NonPublic);
+#else
+            return type.GetTypeInfo().DeclaredProperties;
+#endif
+        }
+
+        internal static bool GetIsConstructedGenericType(this Type type)
+        {
+            if (type == null)
+                throw new ArgumentNullException(nameof(type));
+
+#if NET40
+            return type.IsGenericType && !type.IsGenericTypeDefinition;
+#else
+            return type.IsConstructedGenericType;
+#endif
+        }
+    }
+}
diff --git a/test/IharBury.Expressions.Tests/ExpandExpressionTests.cs b/test/IharBury.Expressions.Tests/ExpandExpressionTests.cs
index 39d0b18..3dbbf66 100644
--- a/test/IharBury.Expressions.Tests/ExpandExpressionTests.cs
+++ b/test/IharBury.Expressions.Tests/ExpandExpressionTests.cs
@@ -475,7 +475,7 @@ protected override Expression VisitInvocation(InvocationExpression node)
                     var methodCallExpression = (MethodCallExpression)node.Expression;
                     Assert.False(
                         (methodCallExpression.Method.DeclaringType != null) &&
-                            methodCallExpression.Method.DeclaringType.IsConstructedGenericType &&
+                            methodCallExpression.Method.DeclaringType.GetIsConstructedGenericType() &&
                             (methodCallExpression.Method.DeclaringType.GetGenericTypeDefinition() == typeof(Expression<>)) &&
                             (methodCallExpression.Method.Name == CompileMethodName),
                         $"The expression body has evaluation: \"{node}\".");
@@ -506,7 +506,7 @@ private static void ValidateMethod(Expression node, MethodInfo method)
                     $"The expression body has evaluation: \"{node}\".");
                 Assert.False(
                     (method.DeclaringType != null) &&
-                        (method.DeclaringType.GetTypeInfo().BaseType == typeof(MulticastDelegate)) &&
+                        (method.DeclaringType.GetBaseType() == typeof(MulticastDelegate)) &&
                         (method.Name == ReflectionExpressions.GetMethodName<Action>(action => action.Invoke())),
                     $"The expression body has invokation: \"{node}\".");
             }
diff --git a/test/IharBury.Expressions.Tests/project.json b/test/IharBury.Expressions.Tests/project.json
index c265e03..90db551 100644
--- a/test/IharBury.Expressions.Tests/project.json
+++ b/test/IharBury.Expressions.Tests/project.json
@@ -28,6 +28,12 @@
         "xunit": "1.9.2",
         "xunit.runner.console": "2.0.0"
       }
+    },
+    "net40": {
+      "dependencies": {
+        "xunit": "1.9.2",
+        "xunit.runner.console": "2.0.0"
+      }
     }
   }
 }