diff --git a/tools/test-runner.c b/tools/test-runner.c
index 430e18e3..5045984c 100644
--- a/tools/test-runner.c
+++ b/tools/test-runner.c
@@ -2413,6 +2413,8 @@ next:
 		l_free(unit_test_abs_path);
 	}
 
+	closedir(d);
+
 exit:
 	l_strfreev(unit_tests);
 }