diff --git a/src/os/unix/ngx_files.c b/src/os/unix/ngx_files.c
index ca5458104..2dfa1b7a1 100644
--- a/src/os/unix/ngx_files.c
+++ b/src/os/unix/ngx_files.c
@@ -413,9 +413,7 @@ ngx_trylock_fd(ngx_fd_t fd)
 {
     struct flock  fl;
 
-    fl.l_start = 0;
-    fl.l_len = 0;
-    fl.l_pid = 0;
+    ngx_memzero(&fl, sizeof(struct flock));
     fl.l_type = F_WRLCK;
     fl.l_whence = SEEK_SET;
 
@@ -432,9 +430,7 @@ ngx_lock_fd(ngx_fd_t fd)
 {
     struct flock  fl;
 
-    fl.l_start = 0;
-    fl.l_len = 0;
-    fl.l_pid = 0;
+    ngx_memzero(&fl, sizeof(struct flock));
     fl.l_type = F_WRLCK;
     fl.l_whence = SEEK_SET;
 
@@ -451,9 +447,7 @@ ngx_unlock_fd(ngx_fd_t fd)
 {
     struct flock  fl;
 
-    fl.l_start = 0;
-    fl.l_len = 0;
-    fl.l_pid = 0;
+    ngx_memzero(&fl, sizeof(struct flock));
     fl.l_type = F_UNLCK;
     fl.l_whence = SEEK_SET;