diff --git a/tests/extra/tc_ufcs_all_kinds/run.sh b/tests/extra/tc_ufcs_all_kinds/run.sh
index 6f3bb9e..d6688b2 100755
--- a/tests/extra/tc_ufcs_all_kinds/run.sh
+++ b/tests/extra/tc_ufcs_all_kinds/run.sh
@@ -19,4 +19,6 @@ else
 fi
 
 export DC ERROR_STYLE
+# gdc uses language specific error message
+export LC_ALL=${LC_ALL:-"C.UTF-8"}
 ${DC} -run generate_tests.d "${1}"