diff --git a/app/build.gradle b/app/build.gradle
index 7f12ccaf..313308fe 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -7,8 +7,8 @@ android {
         applicationId = 'com.tutpro.baresip'
         minSdkVersion 21
         targetSdkVersion 27
-        versionCode = 37
-        versionName = '5.0.0'
+        versionCode = 38
+        versionName = '5.1.0'
         externalNativeBuild {
             cmake {
                 cFlags '-DHAVE_INTTYPES_H'
diff --git a/app/src/main/cpp/baresip.c b/app/src/main/cpp/baresip.c
index 83bebafb..29cfab29 100644
--- a/app/src/main/cpp/baresip.c
+++ b/app/src/main/cpp/baresip.c
@@ -475,7 +475,7 @@ Java_com_tutpro_baresip_BaresipService_baresipStart(JNIEnv *env, jobject instanc
 JNIEXPORT void JNICALL
 Java_com_tutpro_baresip_BaresipService_baresipStop(JNIEnv *env, jobject thiz, jboolean force) {
     LOGD("ua_stop_all upon baresipStop");
-    mqueue_push(mq, ID_UA_STOP_ALL, (void *)force);
+    mqueue_push(mq, ID_UA_STOP_ALL, (void *)((int)force));
     return;
 }