--- a/ipc/ipdl/ipdl/type.py
+++ b/ipc/ipdl/ipdl/type.py
@@ -1364,17 +1364,17 @@ class CheckTypes(TcheckVisitor):
                     p.decl.loc,
                    "managed protocol `%s' requires a `delete()' message to be declared",
                     p.name)
         else:
             cycles = checkcycles(p.decl.type)
             if cycles:
                 self.error(
                     p.decl.loc,
-                    "cycle(s) detected in manager/manages heirarchy: %s",
+                    "cycle(s) detected in manager/manages hierarchy: %s",
                     formatcycles(cycles))
 
         if 1 == len(ptype.managers) and ptype is ptype.manager():
             self.error(
                 p.decl.loc,
                 "top-level protocol `%s' cannot manage itself",
                 p.name)