1 files changed, 1 insertions, 1 deletions
diff --git a/flexint.h b/flexint.h
index 4088715..60e9127 100644
--- a/flexint.h
+++ b/flexint.h
@@ -5,7 +5,7 @@
 
 /* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
 
-#if __STDC_VERSION__ >= 199901L
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
 
 /* C99 says to define __STDC_LIMIT_MACROS before including stdint.h,
  * if you want the limit (max/min) macros for int types.