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-rw-r--r--libc/misc/assert/__assert.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/libc/misc/assert/__assert.c b/libc/misc/assert/__assert.c
index 1ab84fc56..bd3b3a91d 100644
--- a/libc/misc/assert/__assert.c
+++ b/libc/misc/assert/__assert.c
@@ -27,7 +27,6 @@
* and is useful in debugging the stdio code.
*/
-#define _ISOC99_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>