diff --git a/python/paddle/fluid/metrics.py b/python/paddle/fluid/metrics.py
index 25d43be3b7520b53cb2ff2af8583cea2330acfbf..a4503e75671d7d12ff84bb538776f8e6c832b9d1 100644
--- a/python/paddle/fluid/metrics.py
+++ b/python/paddle/fluid/metrics.py
@@ -478,7 +478,7 @@ class EditDistance(MetricBase):
                 "There is no data in EditDistance Metric. Please check layers.edit_distance output has been added to EditDistance."
             )
         avg_distance = self.total_distance / self.seq_num
-        avg_instance_error = self.instance_error / self.seq_num
+        avg_instance_error = self.instance_error / float(self.seq_num)
         return avg_distance, avg_instance_error