diff --git a/src/V3AstNodeOther.h b/src/V3AstNodeOther.h
index 96ae9ee88..fcfb84837 100644
--- a/src/V3AstNodeOther.h
+++ b/src/V3AstNodeOther.h
@@ -1203,6 +1203,7 @@ class AstModportVarRef final : public AstNode {
     // A input/output/etc variable referenced under a modport
     // The storage for the variable itself is inside the interface, thus this is a reference
     // PARENT: AstModport
+    // @astgen op1 := m_exp : Optional[AstNodeExpr]
     //
     // @astgen ptr := m_varp : Optional[AstVar]  // Link to the actual Var
     string m_name;  // Name of the variable referenced
@@ -1212,6 +1213,12 @@ public:
         : ASTGEN_SUPER_ModportVarRef(fl)
         , m_name{name}
         , m_direction{direction} {}
+    AstModportVarRef(FileLine* fl, const string& name, AstNodeExpr* exp, VDirection::en direction)
+        : ASTGEN_SUPER_ModportVarRef(fl)
+        , m_name{name}
+        , m_direction{direction} {
+        this->m_exp(exp);
+    };
     ASTGEN_MEMBERS_AstModportVarRef;
     void dump(std::ostream& str) const override;
     void dumpJson(std::ostream& str) const override;