diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CVisitor.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CVisitor.java
index 3d8b1d6d338..185e073cf4d 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CVisitor.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CVisitor.java
@@ -850,7 +850,8 @@ public class CVisitor {
 			if( binding != null ) {
 			    if( binding instanceof IFunction ){
 			        IFunction function = (IFunction) binding;
-		            ((CFunction)function).addDeclarator( (IASTFunctionDeclarator) declarator );
+			        if( function instanceof CFunction )
+			        	((CFunction)function).addDeclarator( (IASTFunctionDeclarator) declarator );
 			        return function;
 			    }
 		        binding = new ProblemBinding( name, IProblemBinding.SEMANTIC_INVALID_OVERLOAD, name.toCharArray() );