diff --git a/kernel-src/sys/syscalls/fcntl.c b/kernel-src/sys/syscalls/fcntl.c
index 40164cd3..ecdd3204 100644
--- a/kernel-src/sys/syscalls/fcntl.c
+++ b/kernel-src/sys/syscalls/fcntl.c
@@ -9,6 +9,7 @@
 #define F_SETFD  2
 #define F_GETFL  3
 #define F_SETFL  4
+#define F_GETLK64 5
 #define F_SETLK64 6
 #define F_SETLKW64 7
 #define F_DUPFD_CLOEXEC 1030
@@ -59,6 +60,7 @@ syscallret_t syscall_fcntl(context_t *, int fd, int cmd, uint64_t arg) {
 			if (ret.errno == 0)
 				ret.ret = flg ? FD_CLOEXEC : 0;
 			break;
+		case F_GETLK64:
 		case F_SETLK64:
 		case F_SETLKW64:
 			ret.errno = 0;