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-rw-r--r--stdio-common/scanf17.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/stdio-common/scanf17.c b/stdio-common/scanf17.c
index 4478a7022f..b6c0e63ab0 100644
--- a/stdio-common/scanf17.c
+++ b/stdio-common/scanf17.c
@@ -1,6 +1,7 @@
 #undef _GNU_SOURCE
 #define _XOPEN_SOURCE 600
 #undef _LIBC
+#undef _IO_MTSAFE_IO
 /* The following macro definitions are a hack.  They word around disabling
    the GNU extension while still using a few internal headers.  */
 #define u_char unsigned char