diff --git a/nutils/evaluable.py b/nutils/evaluable.py
index 173876d63..33347a69c 100644
--- a/nutils/evaluable.py
+++ b/nutils/evaluable.py
@@ -2028,7 +2028,8 @@ def __init__(self, func:asarray, power:asarray):
     assert func.shape == power.shape
     self.func = func
     self.power = power
-    super().__init__(args=[func,power], shape=func.shape, dtype=float)
+    dtype = float if func.dtype == power.dtype == int else _jointdtype(func.dtype, power.dtype)
+    super().__init__(args=[func,power], shape=func.shape, dtype=dtype)
 
   def _simplified(self):
     if iszero(self.power):