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-rw-r--r--math/math.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/math/math.h b/math/math.h
index 16dd0a5bbb..b171978a5c 100644
--- a/math/math.h
+++ b/math/math.h
@@ -108,7 +108,7 @@ __BEGIN_DECLS
 #undef	__MATHCALL
 
 
-#if defined __USE_MISC || defined __USE_XOPEN || defined __USE_ISOC99
+#if defined __USE_MISC || defined __USE_XOPEN
 /* This variable is used by `gamma' and `lgamma'.  */
 extern int signgam;
 #endif