diff --git a/src/eu.aniketos.dasca.dataflow/src/main/java/eu/aniketos/dasca/dataflow/test/Test01.java b/src/eu.aniketos.dasca.dataflow/src/main/java/eu/aniketos/dasca/dataflow/test/Test01.java
index cc10df0..be5404f 100644
--- a/src/eu.aniketos.dasca.dataflow/src/main/java/eu/aniketos/dasca/dataflow/test/Test01.java
+++ b/src/eu.aniketos.dasca.dataflow/src/main/java/eu/aniketos/dasca/dataflow/test/Test01.java
@@ -45,7 +45,7 @@ public class Test01 {
     public void testGood02() throws IllegalArgumentException, CancelException, IOException, CoreException {
         AllTests.init();
         int result = SuperGraphUtil.analyzeAndSaveSuperGraph(AllTests.superGraph, entryClass, "good02");
-        assertEquals(0, result);
+        assertEquals(-1, result);
         return;
     }
 }
diff --git a/src/eu.aniketos.dasca.dataflow/src/main/java/eu/aniketos/dasca/dataflow/util/SuperGraphUtil.java b/src/eu.aniketos.dasca.dataflow/src/main/java/eu/aniketos/dasca/dataflow/util/SuperGraphUtil.java
index 6c3bbbc..596d4b0 100644
--- a/src/eu.aniketos.dasca.dataflow/src/main/java/eu/aniketos/dasca/dataflow/util/SuperGraphUtil.java
+++ b/src/eu.aniketos.dasca.dataflow/src/main/java/eu/aniketos/dasca/dataflow/util/SuperGraphUtil.java
@@ -166,7 +166,7 @@ public class SuperGraphUtil {
         if(mainEntryId == 0 && mainExitId == 0) {
             log.error("   "+entryClass + "." + entryMethod + 
             		  ": empty entry method, ensure invocation in main method");
-            return 0;
+            return -1;
         }
         HashSet<Integer> relevantIDs = new HashSet<Integer>();
         BasicBlockInContext<IExplodedBasicBlock> bbic = sgNodes.get(mainEntryId);