diff --git a/libs/binder/ndk/ibinder.cpp b/libs/binder/ndk/ibinder.cpp
index eb44683..266ef37 100644
--- a/libs/binder/ndk/ibinder.cpp
+++ b/libs/binder/ndk/ibinder.cpp
@@ -57,7 +57,6 @@
 
 namespace ABpBinderTag {
 
-static std::mutex gLock;
 static const void* kId = "ABpBinder";
 struct Value {
     wp<ABpBinder> binder;
@@ -252,23 +251,28 @@
         return static_cast<ABBinder*>(binder.get());
     }
 
-    // The following code ensures that for a given binder object (remote or local), if it is not an
-    // ABBinder then at most one ABpBinder object exists in a given process representing it.
-    std::lock_guard<std::mutex> lock(ABpBinderTag::gLock);
-
-    ABpBinderTag::Value* value =
-            static_cast<ABpBinderTag::Value*>(binder->findObject(ABpBinderTag::kId));
+    auto* value = static_cast<ABpBinderTag::Value*>(binder->findObject(ABpBinderTag::kId));
     if (value == nullptr) {
         value = new ABpBinderTag::Value;
-        binder->attachObject(ABpBinderTag::kId, static_cast<void*>(value), nullptr /*cookie*/,
-                             ABpBinderTag::clean);
+        auto oldValue = static_cast<ABpBinderTag::Value*>(
+                binder->attachObject(ABpBinderTag::kId, static_cast<void*>(value),
+                                     nullptr /*cookie*/, ABpBinderTag::clean));
+
+        // allocated by another thread
+        if (oldValue) {
+            delete value;
+            value = oldValue;
+        }
     }
 
-    sp<ABpBinder> ret = value->binder.promote();
-    if (ret == nullptr) {
-        ret = new ABpBinder(binder);
-        value->binder = ret;
-    }
+    sp<ABpBinder> ret;
+    binder->withLock([&]() {
+        ret = value->binder.promote();
+        if (ret == nullptr) {
+            ret = sp<ABpBinder>::make(binder);
+            value->binder = ret;
+        }
+    });
 
     return ret;
 }
diff --git a/libs/binder/ndk/ibinder_internal.h b/libs/binder/ndk/ibinder_internal.h
index 22cacb4..f2c69b3 100644
--- a/libs/binder/ndk/ibinder_internal.h
+++ b/libs/binder/ndk/ibinder_internal.h
@@ -105,6 +105,7 @@
     ABpBinder* asABpBinder() override { return this; }
 
    private:
+    friend android::sp<ABpBinder>;
     explicit ABpBinder(const ::android::sp<::android::IBinder>& binder);
 };