diff --git a/package/utils/busybox/patches/220-add_lock_util.patch b/package/utils/busybox/patches/220-add_lock_util.patch
index 623121b9fb9..579b705f346 100644
--- a/package/utils/busybox/patches/220-add_lock_util.patch
+++ b/package/utils/busybox/patches/220-add_lock_util.patch
@@ -109,7 +109,7 @@
 +		if (!waitonly) {
 +			lseek(fd, 0, SEEK_SET);
 +			ftruncate(fd, 0);
-+			snprintf(sizeof(pidstr), pidstr, "%d\n", pid);
++			snprintf(pidstr, sizeof(pidstr), "%d\n", pid);
 +			write(fd, pidstr, strlen(pidstr));
 +			close(fd);
 +		}