--- a/ipc/ipdl/ipdl/type.py
+++ b/ipc/ipdl/ipdl/type.py
@@ -1125,17 +1125,17 @@ class CheckTypes(TcheckVisitor):
                        "asynchronous message `%s' declares return values",
                        mname)
 
         if (mtype.compress and
             (not mtype.isAsync() or mtype.isCtor() or mtype.isDtor())):
 
             if mtype.isCtor() or mtype.isDtor():
                 message_type = "constructor" if mtype.isCtor() else "destructor"
-                error_message = ("%s messages can't use compression (here, in protocol `%s'" %
+                error_message = ("%s messages can't use compression (here, in protocol `%s')" %
                                  (message_type, pname))
             else:
                 error_message = ("message `%s' in protocol `%s' requests compression but is not async" %
                                  (mname, pname))
 
             self.error(loc, error_message)
 
         if mtype.isCtor() and not ptype.isManagerOf(mtype.constructedType()):