diff --git a/block/curl.c b/block/curl.c
index 4f907c47be..d24a4c5897 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -564,23 +564,23 @@ static void curl_detach_aio_context(BlockDriverState *bs)
     BDRVCURLState *s = bs->opaque;
     int i;
 
-    qemu_mutex_lock(&s->mutex);
-    for (i = 0; i < CURL_NUM_STATES; i++) {
-        if (s->states[i].in_use) {
-            curl_clean_state(&s->states[i]);
+    WITH_QEMU_LOCK_GUARD(&s->mutex) {
+        for (i = 0; i < CURL_NUM_STATES; i++) {
+            if (s->states[i].in_use) {
+                curl_clean_state(&s->states[i]);
+            }
+            if (s->states[i].curl) {
+                curl_easy_cleanup(s->states[i].curl);
+                s->states[i].curl = NULL;
+            }
+            g_free(s->states[i].orig_buf);
+            s->states[i].orig_buf = NULL;
         }
-        if (s->states[i].curl) {
-            curl_easy_cleanup(s->states[i].curl);
-            s->states[i].curl = NULL;
+        if (s->multi) {
+            curl_multi_cleanup(s->multi);
+            s->multi = NULL;
         }
-        g_free(s->states[i].orig_buf);
-        s->states[i].orig_buf = NULL;
     }
-    if (s->multi) {
-        curl_multi_cleanup(s->multi);
-        s->multi = NULL;
-    }
-    qemu_mutex_unlock(&s->mutex);
 
     timer_del(&s->timer);
 }