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-rw-r--r--math/tgmath.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/math/tgmath.h b/math/tgmath.h
index 8916fbe39c..de1eb985fe 100644
--- a/math/tgmath.h
+++ b/math/tgmath.h
@@ -392,7 +392,7 @@
    prevailing rounding mode.  */
 #define rint(Val) __TGMATH_UNARY_REAL_ONLY (Val, rint)
 
-#ifdef __USE_GNU
+#if __GLIBC_USE (IEC_60559_BFP_EXT)
 /* Return X - epsilon.  */
 # define nextdown(Val) __TGMATH_UNARY_REAL_ONLY (Val, nextdown)
 /* Return X + epsilon.  */