diff --git a/src/burn/driver.h b/src/burn/driver.h
index e3185d59a..83e7ed363 100644
--- a/src/burn/driver.h
+++ b/src/burn/driver.h
@@ -35,6 +35,15 @@ __extension__ typedef long long				INT64;
 #endif
 #define OSD_CPU_H
 
+/* U64 and S64 are used to wrap long integer constants. */
+#if defined(__GNUC__) || defined(_MSC_VER)
+#define U64(val) val##ULL
+#define S64(val) val##LL
+#else
+#define U64(val) val
+#define S64(val) val
+#endif
+
 /* OPN */
 #define HAS_YM2203  1
 #define HAS_YM2608  1