diff --git a/selftest/trial_test.ok b/selftest/trial_test.ok
index 6ad39a9..8c6a567 100644
--- a/selftest/trial_test.ok
+++ b/selftest/trial_test.ok
@@ -11,6 +11,6 @@
 None
 - test checksum verification
 - detect wrong checksum
-ok, got RuntimeError("Checksum mismatch for '[PATH]/trial_test/invalid_checksum/file2' vs. '[PATH]/trial_test/invalid_checksum/checksums.md5' line 2",)
+ok, got RuntimeError: Checksum mismatch for '[PATH]/trial_test/invalid_checksum/file2' vs. '[PATH]/trial_test/invalid_checksum/checksums.md5' line 2
 - detect missing file
-ok, got RuntimeError("File listed in checksums file but missing in trials dir: '[PATH]/trial_test/missing_file/file2' vs. '[PATH]/trial_test/missing_file/checksums.md5' line 2",)
+ok, got RuntimeError: File listed in checksums file but missing in trials dir: '[PATH]/trial_test/missing_file/file2' vs. '[PATH]/trial_test/missing_file/checksums.md5' line 2