diff --git a/src/include/ngspice.h b/src/include/ngspice.h
index 7c13ef56c..ce6fb66fd 100644
--- a/src/include/ngspice.h
+++ b/src/include/ngspice.h
@@ -171,7 +171,7 @@
 #define open _open
 #define write _write
 #define strcasecmp _stricmp
-#define inline _inline
+#define inline __inline
 #endif