diff --git a/android/build.gradle b/android/build.gradle
index dbfc5edc..c69039c7 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -25,6 +25,9 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
+    if (project.android.hasProperty('namespace')) {
+        namespace 'com.dooboolab.flutterinapppurchase'
+    }
     compileSdkVersion 33
 
     defaultConfig {