diff --git a/python/tvm/_ffi/runtime_ctypes.py b/python/tvm/_ffi/runtime_ctypes.py
index 570a24ed5dd3..fd9f4beb4374 100644
--- a/python/tvm/_ffi/runtime_ctypes.py
+++ b/python/tvm/_ffi/runtime_ctypes.py
@@ -95,8 +95,9 @@ class DataType(ctypes.Structure):
         np.dtype(np.float16): "float16",
         np.dtype(np.float32): "float32",
         np.dtype(np.float64): "float64",
-        np.dtype(np.float_): "float64",
     }
+    if np.__version__.startswith("1."):
+        NUMPY2STR[np.dtype(np.float_)] = "float64"
     STR2DTYPE = {
         "void": {"type_code": DataTypeCode.HANDLE, "bits": 0, "lanes": 0},
         "bool": {"type_code": DataTypeCode.UINT, "bits": 1, "lanes": 1},