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-rw-r--r--libc/string/i386/memmove.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libc/string/i386/memmove.c b/libc/string/i386/memmove.c
index cd746e804..72d8002a5 100644
--- a/libc/string/i386/memmove.c
+++ b/libc/string/i386/memmove.c
@@ -57,7 +57,7 @@ void *memmove(void *dest, const void *src, size_t n)
#ifndef memmove
libc_hidden_def(memmove)
#else
-/* Uncomment TESTING, gcc -D__USE_GNU -m32 -Os memmove.c -o memmove
+/* Uncomment TESTING, gcc -D_GNU_SOURCE -m32 -Os memmove.c -o memmove
* and run ./memmove
*/
int main()