diff --git a/src/V3Ast.h b/src/V3Ast.h
index 28d14395f..3971687ba 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -514,6 +514,7 @@ public:
     inline AstVarAttrClocker (en _e) : m_e(_e) {}
     explicit inline AstVarAttrClocker (int _e) : m_e(static_cast<en>(_e)) {}
     operator en () const { return m_e; }
+    bool unknown() const { return m_e==CLOCKER_UNKNOWN; }
     AstVarAttrClocker invert() const {
 	if (m_e==CLOCKER_YES) return CLOCKER_NO;
 	else if (m_e==CLOCKER_NO) return CLOCKER_YES;
diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index 3b6294958..f06446736 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -977,6 +977,7 @@ void AstVar::dump(ostream& str) {
     if (attrFileDescr()) str<<" [aFD]";
     if (isFuncReturn()) str<<" [FUNCRTN]";
     else if (isFuncLocal()) str<<" [FUNC]";
+    if (!attrClocker().unknown()) str<<" ["<<attrClocker().ascii()<<"] ";
     str<<" "<<varType();
 }
 void AstSenTree::dump(ostream& str) {