diff --git a/postprocessor.py b/postprocessor.py
index 0ab2467..ab5e792 100644
--- a/postprocessor.py
+++ b/postprocessor.py
@@ -727,8 +727,7 @@ class PostProcessor(HDF5Container):
         Mean of Ek/Eb in rho bins
         """
         self.load_cells()
-        mean_speed = self.get_value("/globals/mwa_speed")
-        mean_speed = mean_speed * self.info["unit_velocity"].express(U.km_s)
+        mean_speed = self.get_value("/globals/mwa_speed", unit=U.km_s)
         vel_fluct = (self.cells)["vel"] * self.info["unit_velocity"].express(
             U.km_s
         ) - mean_speed