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-rw-r--r--libc/sysdeps/linux/common/bits/mathcalls.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/common/bits/mathcalls.h b/libc/sysdeps/linux/common/bits/mathcalls.h
index 1e92b527e..013d2b2a7 100644
--- a/libc/sysdeps/linux/common/bits/mathcalls.h
+++ b/libc/sysdeps/linux/common/bits/mathcalls.h
@@ -90,7 +90,7 @@ __MATHCALLI (sinh,, (_Mdouble_ __x))
__MATHCALLI (tanh,, (_Mdouble_ __x))
_Mdouble_END_NAMESPACE
-#if 0 /*def __USE_GNU*/
+#if defined __USE_GNU
/* Cosine and sine of X. */
__MATHDECL (void,sincos,,
(_Mdouble_ __x, _Mdouble_ *__sinx, _Mdouble_ *__cosx))