diff --git a/lib/stackup/parameters.rb b/lib/stackup/parameters.rb
index 5071425..d1d0951 100644
--- a/lib/stackup/parameters.rb
+++ b/lib/stackup/parameters.rb
@@ -45,7 +45,7 @@ def to_a
           if value == :use_previous_value
             record[:use_previous_value] = true
           else
-            record[:parameter_value] = value
+            record[:parameter_value] = ParameterValue.new(value).to_param
           end
         end
       end
@@ -75,7 +75,26 @@ def value
       if use_previous_value
         :use_previous_value
       else
-        parameter_value
+        ParameterValue.new(parameter_value).to_param
+      end
+    end
+
+  end
+
+  class ParameterValue
+
+    def initialize(value)
+      @value = value
+    end
+
+    def to_param
+      case @value
+      when TrueClass, FalseClass, Integer then
+        @value.to_s
+      when Array
+        @value.map { |v| ParameterValue.new(v).to_param }.join(",")
+      else
+        @value
       end
     end
 
diff --git a/spec/stackup/parameters_spec.rb b/spec/stackup/parameters_spec.rb
index 06267a4..e162592 100644
--- a/spec/stackup/parameters_spec.rb
+++ b/spec/stackup/parameters_spec.rb
@@ -146,6 +146,51 @@
 
     end
 
+    context "with non-string values" do
+
+      let(:input_records) do
+        [
+          { :parameter_key => "Integer", :parameter_value => 123_456_789 },
+          { :parameter_key => "Truthy", :parameter_value => true },
+          { :parameter_key => "Falsey", :parameter_value => false },
+          { :parameter_key => "Null", :parameter_value => nil },
+          { :parameter_key => "Array", :parameter_value => ["one", 2] },
+          { :parameter_key => "String", :parameter_value => "string" }
+        ]
+      end
+
+      subject(:parameters) { Stackup::Parameters.new(input_records) }
+
+      describe "#to_hash" do
+        it "converts the to strings where appropriate" do
+          expected = {
+            "Integer" => "123456789",
+            "Truthy" => "true",
+            "Falsey" => "false",
+            "Null" => nil,
+            "Array" => "one,2",
+            "String" => "string"
+          }
+          expect(parameters.to_hash).to eql(expected)
+        end
+      end
+
+      describe "#to_a" do
+        it "converts the to strings where appropriate" do
+          expected = [
+            { :parameter_key => "Integer", :parameter_value => "123456789" },
+            { :parameter_key => "Truthy", :parameter_value => "true" },
+            { :parameter_key => "Falsey", :parameter_value => "false" },
+            { :parameter_key => "Null", :parameter_value => nil },
+            { :parameter_key => "Array", :parameter_value => "one,2" },
+            { :parameter_key => "String", :parameter_value => "string" }
+          ]
+          expect(parameters.to_a).to eql(expected)
+        end
+      end
+
+    end
+
     context "with empty parameter file" do
 
       let(:input_records) { false }