diff --git a/build-android-app.sh b/build-android-app.sh
index 26ae47d..0e3049b 100755
--- a/build-android-app.sh
+++ b/build-android-app.sh
@@ -36,8 +36,10 @@ DOCKERFILEEOF
 }
 
 diff Dockerfile <(DockerfileContent) 2>/dev/null > /dev/null || {
-    read -p 'reset/start Dockerfile[Y/n]' YES
-    test "$YES" = "n" && { echo "aborting..." >&2; exit 1; }
+    test -f Dockerfile && {
+        read -p 'reset/start Dockerfile[Y/n]' YES
+        test "$YES" = "n" && { echo "aborting..." >&2; exit 1; }
+    }
     DockerfileContent > Dockerfile
 }