diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index d8391582c..7247c5a24 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -2268,7 +2268,7 @@ static void linphone_core_init(LinphoneCore * lc, LinphoneCoreCbs *cbs, LpConfig
 	lc->factory = ms_factory_new_with_voip_and_directories(msplugins_dir, image_resources_dir);
 	lc->sal->setFactory(lc->factory);
 
-	belr::GrammarLoader::get().addPath(std::string(linphone_factory_get_top_resources_dir(lfactory)).append("/belr/grammars").c_str());
+	belr::GrammarLoader::get().addPath(std::string(linphone_factory_get_top_resources_dir(lfactory)).append("/belr/grammars"));
 
 	linphone_task_list_init(&lc->hooks);
 
diff --git a/tester/cpim-tester.cpp b/tester/cpim-tester.cpp
index 458399e6d..56064b761 100644
--- a/tester/cpim-tester.cpp
+++ b/tester/cpim-tester.cpp
@@ -313,7 +313,7 @@ test_t cpim_tests[] = {
 
 static int suite_begin(void) {
 	//Supposed to be done by platform helper, but in this case, we don't have it"
-	belr::GrammarLoader::get().load(bc_tester_res("share/belr/grammars/cpim_grammars"));
+	belr::GrammarLoader::get().addPath(std::string(bc_tester_get_resource_dir_prefix()));
 	return 0;
 }
 test_suite_t cpim_test_suite = {