diff --git a/src/tests/elementary/elm_suite.c b/src/tests/elementary/elm_suite.c
index 1e7190ee7e..cd0e3f4b43 100644
--- a/src/tests/elementary/elm_suite.c
+++ b/src/tests/elementary/elm_suite.c
@@ -98,8 +98,9 @@ main(int argc, char **argv)
 
 #ifdef NEED_RUN_IN_TREE
    putenv("EFL_RUN_IN_TREE=1");
-   putenv("EFL_RUN_IN_TREE=1");
 #endif
+   if (!getenv("ELM_ENGINE"))
+     putenv("ELM_ENGINE=buffer");
 
    failed_count = _efl_suite_build_and_run(argc - 1, (const char **)argv + 1,
                                            "Elementary", etc);