diff --git a/eazy/filters.py b/eazy/filters.py
index a4ad302..3939817 100644
--- a/eazy/filters.py
+++ b/eazy/filters.py
@@ -184,8 +184,8 @@ def pivot(self):
         """
         integrator = np.trapz
         
-        num = integrator(self.wave, self.wave*self.throughput)
-        den = integrator(self.wave, self.throughput/self.wave)
+        num = integrator(self.wave*self.throughput, self.wave)
+        den = integrator(self.throughput/self.wave, self.wave)
         pivot = np.sqrt(num/den)
         return pivot