diff --git a/bob/measure/utils.py b/bob/measure/utils.py
index c7b40f1917fe5193e9928828ec4b564ae9d4a8ed..871b45f7e24956de6e58be1156ff40abf5fa41f8 100644
--- a/bob/measure/utils.py
+++ b/bob/measure/utils.py
@@ -46,7 +46,7 @@ def get_fta(scores):
     NaN(s)
     :py:class:`float` : failure to acquire rate
     """
-    fta_sum, fta_total = 0, 0
+    fta_sum, fta_total = 0.0, 0.0
     neg, sum_nans, total = remove_nan(scores[0])
     fta_sum += sum_nans
     fta_total += total