diff --git a/include/verilated.h b/include/verilated.h
index c9a198e19..71b2e0c29 100644
--- a/include/verilated.h
+++ b/include/verilated.h
@@ -753,9 +753,9 @@ static inline void* VL_CVT_Q_VP(QData lhs) VL_PURE {
     u.q = lhs;
     return u.fp;
 }
-/// Return QData from void*
-static inline QData VL_CVT_VP_Q(void* fp) VL_PURE {
-    union { void* fp; QData q; } u;
+/// Return QData from const void*
+static inline QData VL_CVT_VP_Q(const void* fp) VL_PURE {
+    union { const void* fp; QData q; } u;
     u.q = 0;
     u.fp = fp;
     return u.q;