diff --git a/backend/mpc-system/services/service-party-android/build-apk.bat b/backend/mpc-system/services/service-party-android/build-apk.bat
index 44c0b40b..aea6ab74 100644
--- a/backend/mpc-system/services/service-party-android/build-apk.bat
+++ b/backend/mpc-system/services/service-party-android/build-apk.bat
@@ -154,7 +154,8 @@ if not exist "app\libs\tsslib.aar" (
     )
 
     :: Build the AAR (use full path to gomobile)
-    "!GOBIN_DIR!\gomobile.exe" bind -target=android -o "..\app\libs\tsslib.aar" .
+    :: Use -androidapi 21 to ensure compatibility with modern NDK
+    "!GOBIN_DIR!\gomobile.exe" bind -target=android -androidapi 21 -o "..\app\libs\tsslib.aar" .
     if !errorlevel! neq 0 (
         echo [ERROR] gomobile bind failed!
         popd