diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalUnary.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalUnary.java
index 1fdbc79bf35..2ff6835f794 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalUnary.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalUnary.java
@@ -282,7 +282,10 @@ public class EvalUnary extends CPPDependentEvaluation {
 		ICPPFunction overload = getOverload(point);
 		if (overload != null) {
 			ICPPFunctionType functionType = overload.getType();
-			IType targetType = functionType.getParameterTypes()[0];
+			IType[] parameterTypes = functionType.getParameterTypes();
+			if (parameterTypes.length == 0)
+				return Value.ERROR;
+			IType targetType = parameterTypes[0];
 			arg = maybeApplyConversion(arg, targetType, point);
 			
 			if (!(overload instanceof CPPImplicitFunction)) {