diff --git a/llvm_cbuilder/builder.py b/llvm_cbuilder/builder.py
index eaa159e..661c2b1 100644
--- a/llvm_cbuilder/builder.py
+++ b/llvm_cbuilder/builder.py
@@ -429,7 +429,7 @@ class CDefinition(CBuilder):
         functype = lc.Type.function(cls._retty_, [v for k, v in cls._argtys_])
         func = module.get_or_insert_function(functype, name=cls._name_)
         if not func.is_declaration: # already defined?
-            raise NameError('Function %s has already been defined' % cls.name)
+            raise NameError('Function %s has already been defined' % cls._name_)
 
         # Name all arguments
         for i, (name, _) in enumerate(cls._argtys_):
diff --git a/test_parallel_vectorize.py b/test_parallel_vectorize.py
index fbcb133..fd7cc52 100644
--- a/test_parallel_vectorize.py
+++ b/test_parallel_vectorize.py
@@ -95,7 +95,6 @@ class Tester(CDefinition):
         self.ret()
 
 def main():
-    NUM_THREAD = 2
     module = Module.new(__name__)
 
     mpm = PassManager.new()