diff --git a/debug/org.eclipse.cdt.debug.mi.core/src/org/eclipse/cdt/debug/mi/core/output/MIFrame.java b/debug/org.eclipse.cdt.debug.mi.core/src/org/eclipse/cdt/debug/mi/core/output/MIFrame.java
index 1ecc62658e9..eb517ba6d1c 100644
--- a/debug/org.eclipse.cdt.debug.mi.core/src/org/eclipse/cdt/debug/mi/core/output/MIFrame.java
+++ b/debug/org.eclipse.cdt.debug.mi.core/src/org/eclipse/cdt/debug/mi/core/output/MIFrame.java
@@ -84,7 +84,7 @@ public class MIFrame {
 				} catch (NumberFormatException e) {
 				}
 			} else if (var.equals("func")) {
-				func = ( str != null && str.indexOf( "??" ) != -1 ) ? "" : str;
+				func = ( str != null && str.equals( "??" ) ) ? "" : str;
 			} else if (var.equals("file")) {
 				file = str;
 			} else if (var.equals("line")) {