diff --git a/ariadne/services/hermes_sonar_client.py b/ariadne/services/hermes_sonar_client.py
index 981398e..ed19903 100644
--- a/ariadne/services/hermes_sonar_client.py
+++ b/ariadne/services/hermes_sonar_client.py
@@ -171,10 +171,10 @@ def issue_url(incident_id: str, ui_url: str) -> str:
     text = str(incident_id or "")
     if not base or not text.startswith(INCIDENT_PREFIX):
         return ""
-    parts = text[len(INCIDENT_PREFIX) :].split("/", 1)
-    if len(parts) != 2 or not parts[0].strip() or not parts[1].strip():
+    project, separator, key = text[len(INCIDENT_PREFIX) :].partition("/")
+    if not separator or not project.strip() or not key.strip():
         return ""
-    return base + _ISSUE_PATH.format(project=parts[0].strip(), key=parts[1].strip())
+    return base + _ISSUE_PATH.format(project=project.strip(), key=key.strip())
 
 
 def _types(cfg: dict) -> tuple[str, ...]: