diff --git a/tensorflow_probability/python/distributions/power_spherical.py b/tensorflow_probability/python/distributions/power_spherical.py
index 820566e930..acfeafa13a 100644
--- a/tensorflow_probability/python/distributions/power_spherical.py
+++ b/tensorflow_probability/python/distributions/power_spherical.py
@@ -217,8 +217,9 @@ def _log_normalization(self, concentration=None, mean_direction=None):
     concentration1 = concentration + (event_size - 1.) / 2.
     concentration0 = (event_size - 1.) / 2.
 
-    return ((concentration1 + concentration0) * np.log(2.) +
-            concentration0 * np.log(np.pi) +
+    np_dtype = dtype_util.as_numpy_dtype(concentration.dtype)
+    return ((concentration1 + concentration0) * np.log(2.).astype(np_dtype) +
+            concentration0 * np.log(np.pi).astype(np_dtype) +
             special.log_gamma_difference(concentration0, concentration1))
 
   def _sample_control_dependencies(self, samples):