diff --git a/llvm_emulator/stepper.py b/llvm_emulator/stepper.py
index 7cb01bd..f0068ad 100644
--- a/llvm_emulator/stepper.py
+++ b/llvm_emulator/stepper.py
@@ -447,8 +447,8 @@ def ty2base_ty(ty, tdecs, seen=[]):
         elif other_name in tdecs:
             return ty2base_ty(tdecs[other_name].body, tdecs, [other_name] + seen)
         else:
-            err('Could not find type {} in gloval type environment:\n{}'
-                .format(ll.ty2s(ty), tdecs.keys()))
+            err('Could not find type {} in global type environment:\n{}'
+                .format(ll.ty2s(ty), list(tdecs.keys())))
             return ll.SimpleType.Void
     else:
         # TODO