diff --git a/nifty/sugar.py b/nifty/sugar.py
index 21c82510be9650329dda68e7cff1f373558990a3..2eba6e7a2fa7f36e6643e61fc56a3c9cb240cfbb 100644
--- a/nifty/sugar.py
+++ b/nifty/sugar.py
@@ -37,7 +37,7 @@ def create_power_operator(domain, power_spectrum, dtype=None,
                val=power_spectrum, dtype=dtype,
                distribution_strategy=distribution_strategy)
 
-    f = fp.power_synthesize(mean=1, std=0, decompose_power=False)
+    f = fp.power_synthesize(mean=1, std=0, real_signal=True)
 
     power_operator = DiagonalOperator(domain, diagonal=f, bare=True)