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 bc13c642538..244087d549e 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
@@ -8545,5 +8545,13 @@ public class AST2CPPTests extends AST2BaseTest {
 		b= bh.assertNonProblem("f(c32)", 1);
 		assertSame(f2, b);
 	}
-
+	
+	//	int test() {
+	//	    void (11);
+	//	    return 42;
+	//	}
+	public void testCastToVoid_309155() throws Exception {
+		String code= getAboveComment();
+		parseAndCheckBindings(code);
+	}		
 }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/GNUCPPSourceParser.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/GNUCPPSourceParser.java
index fc47609eda2..b0b856d3d78 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/GNUCPPSourceParser.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/GNUCPPSourceParser.java
@@ -1188,6 +1188,7 @@ public class GNUCPPSourceParser extends AbstractGNUSourceCodeParser {
         case IToken.t_float:
         case IToken.t_double:
         case IToken.t_decltype:
+        case IToken.t_void:
         case IGCCToken.t_typeof:
 			firstExpression = simpleTypeConstructorExpression(simpleTypeSpecifier());
         	break;
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
index be866f35f04..af4c6884675 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
@@ -2893,17 +2893,16 @@ public class CPPSemantics {
 		if (op == null)
 			return null;
 		
-		IType op1type = SemanticUtil.getUltimateTypeUptoPointers(exp.getOperand1().getExpressionType());
-		IASTExpression[] args = new IASTExpression[] { exp.getOperand1(), exp.getOperand2() } ;
+		final IASTExpression op1 = exp.getOperand1();
+		final IASTExpression op2 = exp.getOperand2();
+		IType op1type = getNestedType(op1.getExpressionType(), TDEF | REF | CVTYPE);
+		IType op2type = getNestedType(op2.getExpressionType(), TDEF | REF | CVTYPE);
+		if (!isUserDefined(op1type) && !isUserDefined(op2type))
+			return null;
 		
+		IASTExpression[] args = new IASTExpression[] { op1, op2 };
 		NonMemberMode lookupNonMember = NonMemberMode.none;
 		if (exp.getOperator() != IASTBinaryExpression.op_assign) {
-			IType op2type = SemanticUtil.getUltimateTypeUptoPointers(exp.getOperand2().getExpressionType());
-			if (op2type instanceof IProblemBinding)
-				return null;
-			if (!isUserDefined(op1type) && !isUserDefined(op2type))
-				return null;
-			
 			lookupNonMember= NonMemberMode.limited;
 		}
 		
@@ -3089,6 +3088,9 @@ public class CPPSemantics {
 	}
 
 	private static boolean isUserDefined(IType type) {
+		if (type instanceof IProblemBinding)
+			return false;
+		
     	return type instanceof ICPPClassType || type instanceof IEnumeration;
     }