diff --git a/include/integer.h b/include/integer.h
index c6983e544..b420a708f 100644
--- a/include/integer.h
+++ b/include/integer.h
@@ -7,7 +7,7 @@
 #ifndef INTEGER_H
 #define INTEGER_H
 
-#if defined(__STDC__) && __STDC_VERSION__ >= 199101L
+#if (defined(__STDC__) && __STDC_VERSION__ >= 199901L)
 /* The compiler claims to conform to C99. Use stdint.h */
 #include <stdint.h>
 #define SKIP_STDINT_WORKAROUND