diff --git a/seispy/rfcorrect.py b/seispy/rfcorrect.py
index 555260a3..308bf533 100644
--- a/seispy/rfcorrect.py
+++ b/seispy/rfcorrect.py
@@ -191,7 +191,8 @@ def bin_stack(self, key='bazi', lim=[0, 360], val=10):
         idx = np.digitize(self.__dict__[key], bins)
         stacked = {
             'data_prime': np.zeros([bins.size-1, self.rflength]),
-            'count': np.zeros(bins.size-1)
+            'count': np.zeros(bins.size-1),
+            'bins': bins[:-1]+val/2,
         }
         if not self.only_r:
             stacked['datat'] = np.zeros([bins.size-1, self.rflength])