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-rw-r--r--libc/string/i386/strnlen.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libc/string/i386/strnlen.c b/libc/string/i386/strnlen.c
index d9bce6485..3abde48e2 100644
--- a/libc/string/i386/strnlen.c
+++ b/libc/string/i386/strnlen.c
@@ -56,7 +56,7 @@ size_t strnlen(const char *s, size_t count)
#ifndef strnlen
libc_hidden_def(strnlen)
#else
-/* Uncomment TESTING, gcc -D__USE_GNU -m32 -Os strnlen.c -o strnlen
+/* Uncomment TESTING, gcc -D_GNU_SOURCE -m32 -Os strnlen.c -o strnlen
* and run ./strnlen
*/
int main()