diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index a36501eb1..dc556aa00 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -6125,6 +6125,7 @@ private:
     }
     void userIterateAndNext(AstNode* nodep, WidthVP* vup) {
         if (!nodep) return;
+        if (nodep->didWidth()) return;  // Avoid iterating list we have already iterated
         {
             VL_RESTORER(m_vup);
             m_vup = vup;