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-rw-r--r--libc/misc/file/lockf64.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libc/misc/file/lockf64.c b/libc/misc/file/lockf64.c
index 327707ac8..5638d6938 100644
--- a/libc/misc/file/lockf64.c
+++ b/libc/misc/file/lockf64.c
@@ -38,8 +38,10 @@
#include <fcntl.h>
#include <errno.h>
#include <string.h>
+#include <sys/syscall.h>
#ifdef __NR_fcntl64
+extern int fcntl64 (int fd, int cmd, ...);
#define flock flock64
#define fcntl fcntl64
#define F_GETLK F_GETLK64