diff --git a/lti_consumer/lti_1p1/consumer.py b/lti_consumer/lti_1p1/consumer.py
index 1290fc9861af67eade8626a8d43af11b44ee4e15..7341c6144cf93d036348c34f41858321ce91f2fc 100644
--- a/lti_consumer/lti_1p1/consumer.py
+++ b/lti_consumer/lti_1p1/consumer.py
@@ -87,7 +87,7 @@ def parse_result_json(json_str):
     # '@type' must be "Result"
     result_type = json_obj.get("@type")
     if result_type != "Result":
-        msg = f"JSON object does not contain correct @type attribute (should be 'Result', is z{result_type!r})"
+        msg = f"JSON object does not contain correct @type attribute (should be 'Result', is {result_type!r})"
         log.error("[LTI] %s", msg)
         raise Lti1p1Error(msg)