diff --git a/python/paddle/fluid/metrics.py b/python/paddle/fluid/metrics.py
index 0c2800dcf35ed156b71625babea2724f520575e5..fb1bc06fa4910c17607a37243cc3a52cfcb862eb 100644
--- a/python/paddle/fluid/metrics.py
+++ b/python/paddle/fluid/metrics.py
@@ -474,7 +474,7 @@ 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