diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2CPPTests.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2CPPTests.java
index 7715e9b7b6b..d48d0276caf 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2CPPTests.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2CPPTests.java
@@ -10175,7 +10175,7 @@ public class AST2CPPTests extends AST2TestBase {
 	//	template <bool> struct A {};
 	//	template <>
 	//	struct A<false> {
-	//	    typedef int type;
+	//	  typedef int type;
 	//	};
 	//	struct S {};
 	//	const bool b = __is_base_of(S, int);
@@ -10184,6 +10184,44 @@ public class AST2CPPTests extends AST2TestBase {
 		parseAndCheckBindings(getAboveComment(), CPP, true);
 	}
 
+	//	template<typename T, T v>
+	//	struct integral_constant {
+	//	  static constexpr T value = v;
+	//	  typedef integral_constant<T, v> type;
+	//	};
+	//
+	//	typedef integral_constant<bool, true> true_type;
+	//
+	//	typedef integral_constant<bool, false> false_type;
+	//
+	//	template<typename Base, typename Derived>
+	//	struct is_base_of : public integral_constant<bool, __is_base_of(Base, Derived)> {};
+	//
+	//	template<bool, typename T = void>
+	//	struct enable_if {};
+	//
+	//	template<typename T>
+	//	struct enable_if<true, T> {
+	//	  typedef T type;
+	//	};
+	//
+	//	template <class BaseType, class SubType>
+	//	using EnableIfIsBaseOf =
+	//	    typename enable_if<is_base_of<BaseType, SubType>::value, int>::type;
+	//
+	//	class A {};
+	//
+	//	template <typename T>
+	//	class B {};
+	//
+	//	template <typename T, EnableIfIsBaseOf<A, T> = 0>
+	//	using Waldo = B<T>;
+	//
+	//	Waldo<A> c;
+	public void testIsBaseOf_446094() throws Exception {
+		parseAndCheckBindings(getAboveComment(), CPP, true);
+	}
+
 	//  struct Bool { Bool(bool); };
 	//  struct Char { Char(char); };
 	//  struct Short { Short(short); };
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/Value.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/Value.java
index b515e05e01e..744ac6051dd 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/Value.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/Value.java
@@ -359,11 +359,12 @@ public class Value implements IValue {
 		case __is_base_of:
 			type1 = SemanticUtil.getNestedType(type1, TDEF);
 			type2 = SemanticUtil.getNestedType(type2, TDEF);
-			if (type1 instanceof ICPPClassType && type2 instanceof ICPPClassType) {
-				return ClassTypeHelper.isSubclass((ICPPClassType) type2, (ICPPClassType) type1, point) ? 1 : 0;
-			} else {
-				return 0;
+			if (type1 instanceof ICPPClassType && type2 instanceof ICPPClassType &&
+					(type1.isSameType(type2) ||
+							ClassTypeHelper.isSubclass((ICPPClassType) type2, (ICPPClassType) type1, point))) {
+				return 1;
 			}
+			return 0;
 		}
 		return VALUE_CANNOT_BE_DETERMINED;
 	}