diff --git a/t/helper.t b/t/helper.t
index 2ffae33..18bf99b 100755
--- a/t/helper.t
+++ b/t/helper.t
@@ -8,7 +8,7 @@
 
 test_description='Test git-hg-helper'
 
-. ./test-lib.sh
+. "$(dirname "$0")"/test-lib.sh
 
 if ! test_have_prereq PYTHON
 then