diff --git a/src/omero/plugins/admin.py b/src/omero/plugins/admin.py
index ed4bad362..a4c390301 100755
--- a/src/omero/plugins/admin.py
+++ b/src/omero/plugins/admin.py
@@ -1711,7 +1711,7 @@ def jstack(self, args, config):
                 self.ctx.err(jstack[1])
 
         if unknown_services:
-                self.ctx.die(f"{unknown_services} unknown service(s)")
+                self.ctx.die(14, f"{unknown_services} unknown service(s)")
 
     def getdirsize(self, directory, strict=True):
         """