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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 704d499240..a5d5b504f2 100644
--- a/math/math.h
+++ b/math/math.h
@@ -33,7 +33,7 @@ __BEGIN_DECLS
#include <bits/huge_val.h>
/* Get machine-dependent NAN value (returned for some domain errors). */
-#ifdef __USE_GNU
+#ifdef __USE_ISOC9X
# include <bits/nan.h>
#endif