diff --git a/indra/llmath/v4coloru.h b/indra/llmath/v4coloru.h
index 2101efc5fc..cc67302d43 100644
--- a/indra/llmath/v4coloru.h
+++ b/indra/llmath/v4coloru.h
@@ -130,7 +130,11 @@ public:
 	static BOOL parseColor4U(const std::string& buf, LLColor4U* value);
 
 	// conversion
+#ifdef LL_DARWIN
 	operator /*const*/ LLColor4() const
+#else
+	operator const LLColor4() const
+#endif
 	{
 		return LLColor4(*this);
 	}