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 b7f7c8bee72..7d2815987cc 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
@@ -10125,4 +10125,17 @@ public class AST2CPPTests extends AST2TestBase {
 		parseAndCheckBindings(getAboveComment(), CPP, true);
 	}
 
+	//	template <bool>
+	//	struct enable_if {
+	//	};
+	//	template <>
+	//	struct enable_if<true> {
+	//	    typedef void type;
+	//	};
+	//	struct base {};
+	//	struct derived : base {};
+	//	typedef enable_if<__is_base_of(base, derived)>::type T;
+	public void testIsBaseOf_399353() throws Exception {
+		parseAndCheckBindings(getAboveComment(), CPP, true);
+	}
 }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPASTBinaryTypeIdExpression.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPASTBinaryTypeIdExpression.java
index 7953101446d..a0a508069fc 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPASTBinaryTypeIdExpression.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPASTBinaryTypeIdExpression.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- *  Copyright (c) 2004, 2011 IBM Corporation and others.
+ *  Copyright (c) 2004, 2013 IBM Corporation and others.
  *  All rights reserved. This program and the accompanying materials
  *  are made available under the terms of the Eclipse Public License v1.0
  *  which accompanies this distribution, and is available at
@@ -124,7 +124,7 @@ public class CPPASTBinaryTypeIdExpression extends ASTNode implements ICPPASTExpr
 				fEvaluation= EvalFixed.INCOMPLETE;
 			} else {
 				IType t1= CPPVisitor.createType(fOperand1);
-				IType t2= CPPVisitor.createType(fOperand1);
+				IType t2= CPPVisitor.createType(fOperand2);
 				if (t1 == null || t2 == null) {
 					fEvaluation= EvalFixed.INCOMPLETE;
 				} else {