diff --git a/lvis/eval.py b/lvis/eval.py
index 141e95d..d005de4 100644
--- a/lvis/eval.py
+++ b/lvis/eval.py
@@ -437,8 +437,8 @@ def accumulate(self):
                 tps = np.logical_and(dt_m, np.logical_not(dt_ig))
                 fps = np.logical_and(np.logical_not(dt_m), np.logical_not(dt_ig))
 
-                tp_sum = np.cumsum(tps, axis=1).astype(dtype=np.float)
-                fp_sum = np.cumsum(fps, axis=1).astype(dtype=np.float)
+                tp_sum = np.cumsum(tps, axis=1).astype(dtype=float)
+                fp_sum = np.cumsum(fps, axis=1).astype(dtype=float)
 
                 dt_pointers[cat_idx][area_idx] = {
                     "dt_ids": dt_ids,