diff --git a/src/wrf/constants.py b/src/wrf/constants.py
index d660c62..1d400af 100644
--- a/src/wrf/constants.py
+++ b/src/wrf/constants.py
@@ -59,7 +59,6 @@ class ProjectionTypes(object):
                      np.dtype(np.uint32): 4294967295,
                      np.dtype(np.int64): Constants.DEFAULT_FILL_INT64,
                      np.dtype(np.uint64): 18446744073709551614,
-                     np.dtype(np.float_): Constants.DEFAULT_FILL_DOUBLE,
                      np.dtype(np.float32): Constants.DEFAULT_FILL_FLOAT,
                      np.dtype(np.float64): Constants.DEFAULT_FILL_DOUBLE
                      }