diff --git a/src/lib/kaba/dynamic/exception.cpp b/src/lib/kaba/dynamic/exception.cpp
index a261df79..07097882 100644
--- a/src/lib/kaba/dynamic/exception.cpp
+++ b/src/lib/kaba/dynamic/exception.cpp
@@ -546,5 +546,12 @@ void kaba_die(KabaException* e) {
 	just_die(e, trace);
 }
 
+void kaba_assert(bool b) {
+	if (!b) {
+		auto e = new KabaException("assert failed");
+		kaba_die(e);
+	}
+}
+
 }
 
diff --git a/src/lib/kaba/dynamic/exception.h b/src/lib/kaba/dynamic/exception.h
index bb343801..2ed0afca 100644
--- a/src/lib/kaba/dynamic/exception.h
+++ b/src/lib/kaba/dynamic/exception.h
@@ -19,8 +19,8 @@ class KabaException {
 public:
 	string text;
 	KabaException(){}
-	KabaException(const string &message);
-	virtual ~KabaException(){}
+	explicit KabaException(const string &message);
+	virtual ~KabaException() = default;
 	void _cdecl __init__(const string &message);
 	virtual _cdecl void __delete__();
 	virtual _cdecl string message();
@@ -45,6 +45,7 @@ enum class ErrorID {
 
 void _cdecl kaba_raise_exception(KabaException *kaba_exception);
 void kaba_die(KabaException* e);
+void kaba_assert(bool b);
 
 
 
diff --git a/src/lib/kaba/lib/lib_base.cpp b/src/lib/kaba/lib/lib_base.cpp
index 94c8f93e..3aae9f16 100644
--- a/src/lib/kaba/lib/lib_base.cpp
+++ b/src/lib/kaba/lib/lib_base.cpp
@@ -956,6 +956,8 @@ void SIAddPackageBase(Context *c) {
 		func_add_param("e", TypeExceptionXfer);
 	add_func("@die", TypeVoid, &kaba_die, Flags::Static | Flags::RaisesExceptions);
 		func_add_param("e", TypePointer);
+	add_func(Identifier::Assert, TypeVoid, &kaba_assert, Flags::Static | Flags::RaisesExceptions);
+		func_add_param("b", TypeBool);
 
 
 	// type casting
diff --git a/src/lib/kaba/syntax/Identifier.cpp b/src/lib/kaba/syntax/Identifier.cpp
index 15310480..5f0aa843 100644
--- a/src/lib/kaba/syntax/Identifier.cpp
+++ b/src/lib/kaba/syntax/Identifier.cpp
@@ -67,6 +67,7 @@ namespace Identifier {
 	const string Raise = "raise";
 	const string Try = "try";
 	const string Except = "except";
+	const string Assert = "assert";
 	const string If = "if";
 	const string Else = "else";
 	const string While = "while";
diff --git a/src/lib/kaba/syntax/Identifier.h b/src/lib/kaba/syntax/Identifier.h
index fa7d6b09..550979e6 100644
--- a/src/lib/kaba/syntax/Identifier.h
+++ b/src/lib/kaba/syntax/Identifier.h
@@ -67,6 +67,7 @@ namespace Identifier {
 	extern const string Raise;
 	extern const string Try;
 	extern const string Except;
+	extern const string Assert;
 	extern const string If;
 	extern const string Else;
 	extern const string While;