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-rw-r--r--stdlib/stdlib.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/stdlib/stdlib.h b/stdlib/stdlib.h
index a9fd989d39..827e44b8d0 100644
--- a/stdlib/stdlib.h
+++ b/stdlib/stdlib.h
@@ -208,7 +208,7 @@ extern unsigned long long int strtoull (const char *__restrict __nptr,
 #endif /* ISO C99 or use MISC.  */
 
 /* Convert a floating-point number to a string.  */
-#if __GLIBC_USE (IEC_60559_BFP_EXT)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
 extern int strfromd (char *__dest, size_t __size, const char *__format,
 		     double __f)
      __THROW __nonnull ((3));