diff --git a/nifty/operators/smoothing_operator/fft_smoothing_operator.py b/nifty/operators/smoothing_operator/fft_smoothing_operator.py
index 239632615003a04b690b5c2780dcee7a7d6c0fa1..f9e825db33757fb058ae909b94934cdeab4e39f4 100644
--- a/nifty/operators/smoothing_operator/fft_smoothing_operator.py
+++ b/nifty/operators/smoothing_operator/fft_smoothing_operator.py
@@ -70,7 +70,8 @@ class FFTSmoothingOperator(SmoothingOperator):
 
     def _get_transformator(self, dtype):
         if dtype not in self._transformator_cache:
-            self._transformator_cache[dtype] = FFTOperator(self.domain,
-                                                           domain_dtype=dtype,
-                                                           target=np.complex)
+            self._transformator_cache[dtype] = FFTOperator(
+                                                    self.domain,
+                                                    domain_dtype=dtype,
+                                                    target_dtype=np.complex)
         return self._transformator_cache[dtype]