diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 155c9c5..af112cb 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,9 @@ Development Version
 
 Older Versions
 ~~~~~~~~~~~~~~
+Enhancements
+++++++++++++
+- Removed unnecessary multiplication by 1e6 in cosmo.py (thanks @iw381)
 
 v2.0.0
 ------
diff --git a/hmf/cosmo.py b/hmf/cosmo.py
index 48e2c3e..abe171b 100644
--- a/hmf/cosmo.py
+++ b/hmf/cosmo.py
@@ -101,8 +101,7 @@ def mean_density0(self):
         """
         Mean density of universe at z=0, [Msun h^2 / Mpc**3]
         """
-        # fixme: why the *1e6??
-        return (self.cosmo.Om0 * self.cosmo.critical_density0 / self.cosmo.h ** 2).to(u.MsolMass/u.Mpc**3).value * 1e6
+        return (self.cosmo.Om0 * self.cosmo.critical_density0 / self.cosmo.h ** 2).to(u.solMass/u.Mpc**3).value
 
 def get_cosmo(name):
     """