diff --git a/ext/socket/ipsocket.c b/ext/socket/ipsocket.c
index 013294480f..5e5b447266 100644
--- a/ext/socket/ipsocket.c
+++ b/ext/socket/ipsocket.c
@@ -309,7 +309,7 @@ cancel_fast_fallback(void *ptr)
 
     struct fast_fallback_getaddrinfo_shared *arg = (struct fast_fallback_getaddrinfo_shared *)ptr;
 
-    rb_nativethread_lock_lock(arg->lock);
+    rb_nativethread_lock_lock(&arg->lock);
     {
         arg->cancelled = true;
         char notification = SELECT_CANCELLED;
@@ -317,7 +317,7 @@ cancel_fast_fallback(void *ptr)
             rb_syserr_fail(errno, "write(2)");
         }
     }
-    rb_nativethread_lock_unlock(arg->lock);
+    rb_nativethread_lock_unlock(&arg->lock);
 }
 
 struct hostname_resolution_result
@@ -595,9 +595,7 @@ init_fast_fallback_inetsock_internal(VALUE v)
     arg->getaddrinfo_shared = allocate_fast_fallback_getaddrinfo_shared(arg->family_size);
     if (!arg->getaddrinfo_shared) rb_syserr_fail(errno, "calloc(3)");
 
-    arg->getaddrinfo_shared->lock = calloc(1, sizeof(rb_nativethread_lock_t));
-    if (!arg->getaddrinfo_shared->lock) rb_syserr_fail(errno, "calloc(3)");
-    rb_nativethread_lock_initialize(arg->getaddrinfo_shared->lock);
+    rb_nativethread_lock_initialize(&arg->getaddrinfo_shared->lock);
 
     arg->getaddrinfo_shared->notify = hostname_resolution_notifier;
     arg->getaddrinfo_shared->cancelled = false;
@@ -1198,7 +1196,7 @@ fast_fallback_inetsock_cleanup(VALUE v)
             int shared_need_free = 0;
             int need_free[2] = { 0, 0 };
 
-            rb_nativethread_lock_lock(getaddrinfo_shared->lock);
+            rb_nativethread_lock_lock(&getaddrinfo_shared->lock);
             {
                 for (int i = 0; i < arg->family_size; i++) {
                     if (arg->getaddrinfo_entries[i] && --(arg->getaddrinfo_entries[i]->refcount) == 0) {
@@ -1209,7 +1207,7 @@ fast_fallback_inetsock_cleanup(VALUE v)
                     shared_need_free = 1;
                 }
             }
-            rb_nativethread_lock_unlock(getaddrinfo_shared->lock);
+            rb_nativethread_lock_unlock(&getaddrinfo_shared->lock);
 
             for (int i = 0; i < arg->family_size; i++) {
                 if (need_free[i]) free_fast_fallback_getaddrinfo_entry(&arg->getaddrinfo_entries[i]);
diff --git a/ext/socket/raddrinfo.c b/ext/socket/raddrinfo.c
index 5759960e5a..ea24884680 100644
--- a/ext/socket/raddrinfo.c
+++ b/ext/socket/raddrinfo.c
@@ -3033,7 +3033,7 @@ free_fast_fallback_getaddrinfo_shared(struct fast_fallback_getaddrinfo_shared **
     (*shared)->node = NULL;
     free((*shared)->service);
     (*shared)->service = NULL;
-    rb_nativethread_lock_destroy((*shared)->lock);
+    rb_nativethread_lock_destroy(&(*shared)->lock);
     free(*shared);
     *shared = NULL;
 }
@@ -3092,7 +3092,7 @@ do_fast_fallback_getaddrinfo(void *ptr)
         }
     }
 
-    rb_nativethread_lock_lock(shared->lock);
+    rb_nativethread_lock_lock(&shared->lock);
     {
         entry->err = err;
         if (shared->cancelled) {
@@ -3112,7 +3112,7 @@ do_fast_fallback_getaddrinfo(void *ptr)
         if (--(entry->refcount) == 0) need_free = 1;
         if (--(shared->refcount) == 0) shared_need_free = 1;
     }
-    rb_nativethread_lock_unlock(shared->lock);
+    rb_nativethread_lock_unlock(&shared->lock);
 
     if (need_free && entry) {
         free_fast_fallback_getaddrinfo_entry(&entry);
diff --git a/ext/socket/rubysocket.h b/ext/socket/rubysocket.h
index 16cc75aa7b..a7a4bae95b 100644
--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -443,7 +443,7 @@ struct fast_fallback_getaddrinfo_shared
     int notify, refcount;
     int cancelled;
     char *node, *service;
-    rb_nativethread_lock_t *lock;
+    rb_nativethread_lock_t lock;
     struct fast_fallback_getaddrinfo_entry getaddrinfo_entries[FLEX_ARY_LEN];
 };