diff --git a/tests-extra/tests/dnssec/offline_ksk/test.py b/tests-extra/tests/dnssec/offline_ksk/test.py
index ec85606d121a0c2602aa5e8e4e6baad708715c82..cb4c8febd652aa8e9f815ce6c036f8fae203eb30 100644
--- a/tests-extra/tests/dnssec/offline_ksk/test.py
+++ b/tests-extra/tests/dnssec/offline_ksk/test.py
@@ -194,7 +194,7 @@ writef(SKR, out)
 
 cripple_skr(SKR, SKR_BROKEN)
 _, _, err = Keymgr.run_check(knot.confile, ZONE, "validate-skr", SKR_BROKEN)
-if err.split()[0] != "Error:":
+if err.split()[0].casefold() != "error:":
     set_err("keymgr validate-skr")
     detail_log(err)
 Keymgr.run_fail(knot.confile, ZONE, "import-skr", SKR_BROKEN)