diff --git a/PythonAPI/pycocotools/cocoeval.py b/PythonAPI/pycocotools/cocoeval.py
index f4e3decb..fe2c81ae 100644
--- a/PythonAPI/pycocotools/cocoeval.py
+++ b/PythonAPI/pycocotools/cocoeval.py
@@ -375,8 +375,8 @@ def accumulate(self, p = None):
                     tps = np.logical_and(               dtm,  np.logical_not(dtIg) )
                     fps = np.logical_and(np.logical_not(dtm), np.logical_not(dtIg) )
 
-                    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(float)
+                    fp_sum = np.cumsum(fps, axis=1).astype(float)
                     for t, (tp, fp) in enumerate(zip(tp_sum, fp_sum)):
                         tp = np.array(tp)
                         fp = np.array(fp)