1 files changed, 3 insertions, 2 deletions
diff --git a/src/java/native/com_libmailcore_IMAPFetchContentOperation.cpp b/src/java/native/com_libmailcore_IMAPFetchContentOperation.cpp
index a8be97b8..24d3a090 100644
--- a/src/java/native/com_libmailcore_IMAPFetchContentOperation.cpp
+++ b/src/java/native/com_libmailcore_IMAPFetchContentOperation.cpp
@@ -38,9 +38,10 @@ JNIEXPORT void JNICALL Java_com_libmailcore_IMAPFetchContentOperation_setupNativ
     MC_SAFE_RELEASE(callback);
     MC_JAVA_NATIVE_INSTANCE->setImapCallback(NULL);
 
-    jobject javaListener = getObjectField(env, obj, "listener");
+    jobject javaListener = getObjectField(env, obj, "listener", "Lcom/libmailcore/IMAPOperationProgressListener;");
     if (javaListener != NULL) {
-        callback = new JavaIMAPOperationCallback(env, javaListener);
+        jobject c = reinterpret_cast<jobject>(env->NewGlobalRef(javaListener));
+        callback = new JavaIMAPOperationCallback(env, c);
         MC_JAVA_NATIVE_INSTANCE->setImapCallback(callback);
     }
     MC_POOL_END;