diff --git a/liblinphone_tester/Makefile b/liblinphone_tester/Makefile
index a20cfa92d..1899a7cc2 100644
--- a/liblinphone_tester/Makefile
+++ b/liblinphone_tester/Makefile
@@ -1,4 +1,7 @@
-all: 
+clean:
+	killall adb
+
+all: clean
 	ant debug install
 
 run-all-tests: all
diff --git a/tests/Makefile b/tests/Makefile
index 0383a7073..49254f07f 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -9,6 +9,7 @@ else
 endif
 
 clean:
+	killall adb
 	$(SDK_PLATFORM_TOOLS_PATH)/adb uninstall org.linphone.test
 	$(SDK_PLATFORM_TOOLS_PATH)/adb uninstall org.linphone
 	$(SDK_PATH)/android update test-project --path . -m ../