diff --git a/plugins/org.eclipse.dd.mi/src/org/eclipse/dd/mi/service/command/output/MIStackListArgumentsInfo.java b/plugins/org.eclipse.dd.mi/src/org/eclipse/dd/mi/service/command/output/MIStackListArgumentsInfo.java
index 4d7f84cec84..2c82922f5c9 100644
--- a/plugins/org.eclipse.dd.mi/src/org/eclipse/dd/mi/service/command/output/MIStackListArgumentsInfo.java
+++ b/plugins/org.eclipse.dd.mi/src/org/eclipse/dd/mi/service/command/output/MIStackListArgumentsInfo.java
@@ -37,7 +37,7 @@ public class MIStackListArgumentsInfo extends MIInfo {
                         MIValue val = results[i].getMIValue();
                         if (val instanceof MIList) {
                             parseStack((MIList)val, aList);
-                        } else if (val instanceof MIList) {
+                        } else if (val instanceof MITuple) {
                             parseStack((MITuple)val, aList);
                         }
                     }