diff --git a/dialer/build.sh b/dialer/build.sh
index 6416762..994a92e 100755
--- a/dialer/build.sh
+++ b/dialer/build.sh
@@ -2,4 +2,9 @@
 
 IMG=git.gmoker.com/icing/flutter:main
 
-docker run --rm -v "$PWD:/app/" "$IMG" build apk
+if [ "$1" == -s ]; then
+    OPT+=(--dart-define=STEALTH=true)
+fi
+
+set -x
+docker run --rm -v "$PWD:/app/" "$IMG" build apk "${OPT[@]}"
diff --git a/dialer/run.sh b/dialer/run.sh
index 3a8ccb7..aa71e83 100755
--- a/dialer/run.sh
+++ b/dialer/run.sh
@@ -2,4 +2,9 @@
 
 IMG=git.gmoker.com/icing/flutter:main
 
-docker run --rm -p 5037:5037 -v "$PWD:/app/" "$IMG" run
+if [ "$1" == -s ]; then
+    OPT+=(--dart-define=STEALTH=true)
+fi
+
+set -x
+docker run --rm -p 5037:5037 -v "$PWD:/app/" "$IMG" run "${OPTS[@]}"