diff --git a/plugins/org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/providers/TransitionPriorityDecorationProvider.java b/plugins/org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/providers/TransitionPriorityDecorationProvider.java
index 246402efc5..c7ea9867cf 100644
--- a/plugins/org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/providers/TransitionPriorityDecorationProvider.java
+++ b/plugins/org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/providers/TransitionPriorityDecorationProvider.java
@@ -119,7 +119,9 @@ public void createDecorators(TransitionEditPart editPart) {
 		public int getPriority(TransitionEditPart editPart) {
 			Transition transition = ((Transition) editPart.resolveSemanticElement());
 			Vertex container = (Vertex) transition.eContainer();
-			return container.getOutgoingTransitions().indexOf(transition);
+			int indexOf = container.getOutgoingTransitions().indexOf(transition);
+			//visible priorities should start with 1
+			return indexOf+1;
 		}
 	}