diff --git a/renderdoc/shaders/controlflow.h b/renderdoc/shaders/controlflow.h
index e0e711f2c..60aa37fd9 100644
--- a/renderdoc/shaders/controlflow.h
+++ b/renderdoc/shaders/controlflow.h
@@ -71,7 +71,9 @@ public:
   }
   void AddMergePoint(ExecutionPoint execPoint)
   {
-    m_MergePoints.push_back(execPoint);
+    // only add a new merge point
+    if(execPoint != m_MergePoints.back())
+      m_MergePoints.push_back(execPoint);
     m_StateChanged = true;
   }
   void AddFunctionReturnPoint(ExecutionPoint execPoint)