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-rw-r--r--include/c99/stdbool.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/c99/stdbool.h b/include/c99/stdbool.h
index 99a735dfa76..99af1a021bf 100644
--- a/include/c99/stdbool.h
+++ b/include/c99/stdbool.h
@@ -35,7 +35,8 @@
#define bool _Bool
/* For compilers that don't have the builtin _Bool type. */
-#if defined(_MSC_VER) || (__STDC_VERSION__ < 199901L && __GNUC__ < 3)
+#if (defined(_MSC_VER) && _MSC_VER < 1800) || \
+ (defined __GNUC__&& __STDC_VERSION__ < 199901L && __GNUC__ < 3)
typedef unsigned char _Bool;
#endif