diff --git a/src/V3LinkInc.cpp b/src/V3LinkInc.cpp
index 9c8a645b1..73dbe7ab5 100644
--- a/src/V3LinkInc.cpp
+++ b/src/V3LinkInc.cpp
@@ -190,7 +190,8 @@ private:
         // Prepare a temporary variable
         FileLine* fl = backp->fileline();
         string name = string("__Vincrement") + cvtToStr(++m_modIncrementsNum);
-        AstVar* varp = new AstVar(fl, AstVarType::BLOCKTEMP, name, varrefp->varp()->subDTypep());
+        AstVar* varp = new AstVar(fl, AstVarType::BLOCKTEMP, name, VFlagChildDType(),
+                                  varrefp->varp()->subDTypep()->cloneTree(true));
 
         // Declare the variable
         insertBeforeStmt(nodep, varp);