diff --git a/hexrd/wppf/WPPF.py b/hexrd/wppf/WPPF.py
index 45a326925..b93ee0fab 100644
--- a/hexrd/wppf/WPPF.py
+++ b/hexrd/wppf/WPPF.py
@@ -2287,7 +2287,7 @@ def _set_params_vals_to_class(self, params, init=False, skip_phases=False):
                 if updated_lp or updated_atominfo:
                     self.calcsf()
 
-            self.phases.phase_fraction = pf
+            self.phases.phase_fraction = pf/np.sum(pf)
 
     def _update_shkl(self, params):
         """
diff --git a/hexrd/wppf/phase.py b/hexrd/wppf/phase.py
index fe6c81505..48f9dc08c 100644
--- a/hexrd/wppf/phase.py
+++ b/hexrd/wppf/phase.py
@@ -1558,7 +1558,8 @@ def phase_fraction(self):
         for k in self:
             l = list(self.wavelength.keys())[0]
             pf.append(self[k][l].pf)
-        return np.array(pf)
+        pf = np.array(pf)
+        return pf/np.sum(pf)
 
     @phase_fraction.setter
     def phase_fraction(self, val):