diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/togglefunction/ToggleNodeHelper.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/togglefunction/ToggleNodeHelper.java
index 795d40638b3..071b2c2e892 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/togglefunction/ToggleNodeHelper.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/togglefunction/ToggleNodeHelper.java
@@ -341,8 +341,10 @@ public class ToggleNodeHelper extends NodeHelper {
 	}
 
 	public static String getFilenameWithoutExtension(String filename) {
-		int index = filename.lastIndexOf('.');
-		return filename.substring(0, index);
+		int indexP = filename.lastIndexOf('.');
+		int indexS = filename.lastIndexOf('/');
+		indexS++;
+		return filename.substring(indexS, indexP);
 	}
 
 	/**