diff --git a/loopy/kernel/data.py b/loopy/kernel/data.py
index 5195e0a107ad4c7f944f2eb56b5f3b248b5a4997..001dd06326edcad14d8ecd39e29229dd45de8ef2 100644
--- a/loopy/kernel/data.py
+++ b/loopy/kernel/data.py
@@ -379,10 +379,10 @@ class TemporaryVariable(ArrayBase):
                         "offset must be 0 if initializer specified"
                         % name)
 
+            from loopy.types import NumpyType, to_loopy_type
             if dtype is auto or dtype is None:
-                from loopy.types import NumpyType
                 dtype = NumpyType(initializer.dtype)
-            elif dtype.numpy_dtype != initializer.dtype:
+            elif to_loopy_type(dtype) != to_loopy_type(initializer.dtype):
                 raise LoopyError(
                         "temporary variable '%s': "
                         "dtype of initializer does not match "