diff --git a/spice/macros.h b/spice/macros.h
index 62157b4..78538a5 100644
--- a/spice/macros.h
+++ b/spice/macros.h
@@ -101,6 +101,12 @@
 # define SPICE_END_DECLS
 #endif
 
+#ifdef __GNUC__
+#define INLINE inline
+#else
+#define INLINE _inline
+#endif /* __GNUC__ */
+
 #ifndef	FALSE
 #define	FALSE	(0)
 #endif