diff --git a/app/src/main/cpp/baresip.c b/app/src/main/cpp/baresip.c
index a2304100..056e805e 100644
--- a/app/src/main/cpp/baresip.c
+++ b/app/src/main/cpp/baresip.c
@@ -908,13 +908,9 @@ Java_com_tutpro_baresip_Api_account_1set_1stun_1pass(JNIEnv *env, jobject thiz,
 }
 
 JNIEXPORT jint JNICALL
-Java_com_tutpro_baresip_Api_account_1set_1mwi(JNIEnv *env, jobject thiz, jlong acc, jstring jValue)
+Java_com_tutpro_baresip_Api_account_1set_1mwi(JNIEnv *env, jobject thiz, jlong acc, jboolean value)
 {
-    const char *value = (*env)->GetStringUTFChars(env, jValue, 0);
-    LOGD("setting account mwi '%s'\n", value);
-    int res = account_set_mwi((struct account *)acc, value);
-    (*env)->ReleaseStringUTFChars(env, jValue, value);
-    return res;
+    return account_set_mwi((struct account *)acc, value);
 }
 
 JNIEXPORT jstring JNICALL
@@ -955,8 +951,7 @@ Java_com_tutpro_baresip_Api_account_1rtcp_1mux(JNIEnv *env, jobject thiz, jlong
 }
 
 JNIEXPORT jint JNICALL
-Java_com_tutpro_baresip_Api_account_1set_1rtcp_1mux(JNIEnv *env, jobject thiz, jlong acc,
-                                                    jboolean value)
+Java_com_tutpro_baresip_Api_account_1set_1rtcp_1mux(JNIEnv *env, jobject thiz, jlong acc, jboolean value)
 {
     return account_set_rtcp_mux((struct account *)acc, value);
 }
diff --git a/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
index 1af1d076..5680afb5 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
@@ -622,9 +622,9 @@ class AccountActivity : AppCompatActivity() {
                                     String.format(getString(R.string.invalid_sip_or_tel_uri), tVmUri))
                             return false
                         }
-                        Api.account_set_mwi(acc.accp, "yes")
+                        Api.account_set_mwi(acc.accp, true)
                     } else {
-                        Api.account_set_mwi(acc.accp, "no")
+                        Api.account_set_mwi(acc.accp, false)
                     }
                     acc.vmUri = tVmUri
                     save = true
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Api.kt b/app/src/main/kotlin/com/tutpro/baresip/Api.kt
index 312d8f0f..93fb9ba1 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Api.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Api.kt
@@ -42,7 +42,7 @@ object Api {
     external fun account_set_medianat(acc: Long, medianat: String): Int
     external fun account_set_audio_codecs(acc: Long, codecs: String): Int
     external fun account_set_video_codecs(acc: Long, codecs: String): Int
-    external fun account_set_mwi(acc: Long, value: String): Int
+    external fun account_set_mwi(acc: Long, value: Boolean): Int
     external fun account_vm_uri(acc: Long): String
     external fun account_answermode(acc: Long): Int
     external fun account_set_answermode(acc: Long, mode: Int): Int