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-rw-r--r--libc/stdio/scanf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libc/stdio/scanf.c b/libc/stdio/scanf.c
index 0b9e8007c..c8b487ed1 100644
--- a/libc/stdio/scanf.c
+++ b/libc/stdio/scanf.c
@@ -33,6 +33,7 @@
#include <stdlib.h>
#include <unistd.h>
+#define __USE_ISOC99
#include <stdio.h>
#include <ctype.h>
#include <string.h>