diff --git a/fashionpedia/fp_eval.py b/fashionpedia/fp_eval.py
index d54d65f..8fd7324 100644
--- a/fashionpedia/fp_eval.py
+++ b/fashionpedia/fp_eval.py
@@ -438,8 +438,8 @@ def accumulate(self, p=None, fpParams=None):
                         "dtMatches": dtMatches,
                     }
 
-                    tpSum = np.cumsum(tps, axis=2).astype(dtype=np.float)
-                    fpSum = np.cumsum(fps, axis=2).astype(dtype=np.float)
+                    tpSum = np.cumsum(tps, axis=2).astype(dtype=np.float64)
+                    fpSum = np.cumsum(fps, axis=2).astype(dtype=np.float64)
 
                     for iouThrIdx in range(numIous):
                         for f1Idx in range(numF1s):