diff --git a/src/V3Number.h b/src/V3Number.h
index 1dbec5d36..f149c6ae6 100644
--- a/src/V3Number.h
+++ b/src/V3Number.h
@@ -77,9 +77,9 @@ private:
     // CONSTANTS
     // At least 2 words (64 fourstate bits). 4 words (128 fourstate bits) in most cases,
     // i.e. when std::string has 32 bytes.
-    static constexpr int INLINE_WORDS
-        = vlstd::max(2UL, vlstd::max(sizeof(std::string) / sizeof(ValueAndX),
-                                     sizeof(std::vector<ValueAndX>) / sizeof(ValueAndX)));
+    static constexpr int INLINE_WORDS = vlstd::max(
+        static_cast<size_t>(2), vlstd::max(sizeof(std::string) / sizeof(ValueAndX),
+                                           sizeof(std::vector<ValueAndX>) / sizeof(ValueAndX)));
     // When m_width > MAX_INLINE_WIDTH number is stored in m_dynamicNumber.
     // Otherwise number is stored in m_inlineNumber.
     static constexpr int MAX_INLINE_WIDTH = INLINE_WORDS * sizeof(ValueAndX) / 2 * 8;