diff --git a/tester/cpim-tester.cpp b/tester/cpim-tester.cpp
index 74eb70524..66cc661d8 100644
--- a/tester/cpim-tester.cpp
+++ b/tester/cpim-tester.cpp
@@ -428,7 +428,7 @@ static void cpim_chat_message_modifier_base(bool_t use_multipart) {
 	marieMessage->send();
 
 	BC_ASSERT_TRUE(wait_for(pauline->lc,marie->lc,&pauline->stat.number_of_LinphoneMessageReceived,1));
-	BC_ASSERT_STRING_EQUAL(marieMessage->getInternalContent().getContentType().asString().c_str(), ""); // Internal content is cleaned after message is sent or received
+	BC_ASSERT_TRUE(marieMessage->getInternalContent().getContentType().isEmpty()); // Internal content is cleaned after message is sent or received
 
 	BC_ASSERT_PTR_NOT_NULL(pauline->stat.last_received_chat_message);
 	if (pauline->stat.last_received_chat_message != NULL) {