diff --git a/BUILD.gn b/BUILD.gn
index 6ee7c7da..2a319296 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -44,6 +44,7 @@ ohos_shared_library("libmimalloc_shared") {
       "MI_SHARED_LIB",
       "MI_SHARED_LIB_EXPORT",
       "MI_TLS_PTHREAD",
+      "MI_USE_SYNCHRONIZED_ITERATE",
       "__OHOS__",
       "mimalloc_EXPORTS"
   ]
@@ -65,6 +66,7 @@ ohos_static_library("libmimalloc_static") {
   defines = [
     "MI_MALLOC_OVERRIDE",
     "MI_TLS_PTHREAD",
+    "MI_USE_SYNCHRONIZED_ITERATE",
     "__OHOS__",
     "mimalloc_EXPORTS"
   ]
diff --git a/src/heap.c b/src/heap.c
index 7ec68e43..26e90dce 100644
--- a/src/heap.c
+++ b/src/heap.c
@@ -15,7 +15,7 @@ terms of the MIT license. A copy of the license can be found in the file
 #pragma warning(disable:4204)  // non-constant aggregate initializer
 #endif
 
-#if defined(USE_SYNCHRONIZED_ITERATE)
+#if defined(MI_USE_SYNCHRONIZED_ITERATE)
 mi_decl_cache_align _Atomic(bool) heap_init_disabled; // = 0
 #endif
 
@@ -632,7 +632,7 @@ int mi_malloc_iterate(void* base, size_t size, void (*callback)(void* base, size
   return 0;
 }
 
-#if defined(USE_SYNCHRONIZED_ITERATE)
+#if defined(MI_USE_SYNCHRONIZED_ITERATE)
 static inline void mi_common_lock(_Atomic(bool) *flag) {
   while (mi_atomic_exchange_acq_rel(flag, true)) {
     mi_atomic_yield();
@@ -646,17 +646,18 @@ static inline void mi_common_unlock(_Atomic(bool) *flag) {
 
 
 bool _mi_heap_lock_malloc(void) {
-#if defined(USE_SYNCHRONIZED_ITERATE)
+#if defined(MI_USE_SYNCHRONIZED_ITERATE)
   mi_heap_t *heap = mi_get_default_heap();
   if (mi_unlikely(heap == NULL || heap->tld == NULL))
     return false;
   mi_common_lock(&heap->tld->malloc_disabled);
   return true;
 #endif
+  return false;
 }
 
 void _mi_heap_unlock_malloc(void) {
-#if defined(USE_SYNCHRONIZED_ITERATE)
+#if defined(MI_USE_SYNCHRONIZED_ITERATE)
   mi_heap_t *heap = mi_get_default_heap();
   if (mi_likely(heap != NULL && heap->tld != NULL))
     mi_common_unlock(&heap->tld->malloc_disabled);
@@ -664,7 +665,7 @@ void _mi_heap_unlock_malloc(void) {
 }
 
 void _mi_heap_lock_iterate(void) {
-#if defined(USE_SYNCHRONIZED_ITERATE)
+#if defined(MI_USE_SYNCHRONIZED_ITERATE)
   mi_common_lock(&heap_init_disabled);
   mi_heap_t* heap = _mi_heap_main_get();
   while (heap != NULL) {
@@ -676,7 +677,7 @@ void _mi_heap_lock_iterate(void) {
 }
 
 void _mi_heap_unlock_iterate(void) {
-#if defined(USE_SYNCHRONIZED_ITERATE)
+#if defined(MI_USE_SYNCHRONIZED_ITERATE)
   mi_heap_t* heap = _mi_heap_main_get();
   while (heap != NULL) {
     if (heap->tld != NULL)
diff --git a/src/init.c b/src/init.c
index 76be1f98..11164e81 100644
--- a/src/init.c
+++ b/src/init.c
@@ -15,7 +15,7 @@ terms of the MIT license. A copy of the license can be found in the file
 static mi_decl_cache_align _Atomic(bool) lock_heap_queue; // = 0
 static mi_heap_t*                        heap_queue_last; // = NULL
 
-#if defined(USE_SYNCHRONIZED_ITERATE)
+#if defined(MI_USE_SYNCHRONIZED_ITERATE)
 extern mi_decl_cache_align _Atomic(bool) heap_init_disabled; // = 0
 #endif
 
@@ -343,7 +343,7 @@ static bool _mi_heap_init(void) {
     tld->segments.os = &tld->os;
     tld->os.stats = &tld->stats;
     _mi_heap_set_default_direct(heap);    
-#if defined(USE_SYNCHRONIZED_ITERATE)
+#if defined(MI_USE_SYNCHRONIZED_ITERATE)
     while (mi_atomic_load_acquire(&heap_init_disabled)) {}
 #endif
     mi_heap_queue_push(heap);