diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPNamespaceScope.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPNamespaceScope.java
index 1e21fcab3c5..54c580a3518 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPNamespaceScope.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPNamespaceScope.java
@@ -160,7 +160,7 @@ public class CPPNamespaceScope extends CPPScope implements ICPPInternalNamespace
 		IScope scope= this;
 		IASTName[] segments= name.getNames();
 		try {
-			for (int i= segments.length; --i >= 0;) {
+			for (int i= segments.length - 1; --i >= 0;) {
 				if (scope == null)
 					return false;
 				IName scopeName = scope.getScopeName();