1 files changed, 1 insertions, 1 deletions
diff --git a/lib/os.h b/lib/os.h
index 50d808a3..416a401d 100644
--- a/lib/os.h
+++ b/lib/os.h
@@ -30,7 +30,7 @@
 
 #  ifdef __GNUC__
 #    define STIN static __inline__
-#  elif _WIN32
+#  elif defined(_WIN32)
 #    define STIN static __inline
 #  else
 #    define STIN static