diff --git a/python/taichi/_kernels.py b/python/taichi/_kernels.py
index 2ba84da6dec70..69664fed0d8e8 100644
--- a/python/taichi/_kernels.py
+++ b/python/taichi/_kernels.py
@@ -19,9 +19,10 @@
 
 # A set of helper (meta)functions
 @kernel
-def fill_tensor(tensor: template(), val: template()):
-    for I in grouped(tensor):
-        tensor[I] = val
+def fill_field(field: template(), val: template()):
+    value = ops.cast(val, field.dtype)
+    for I in grouped(field):
+        field[I] = value
 
 
 @kernel
diff --git a/python/taichi/lang/field.py b/python/taichi/lang/field.py
index 40b31fcaf7acf..4c7c026450108 100644
--- a/python/taichi/lang/field.py
+++ b/python/taichi/lang/field.py
@@ -282,9 +282,9 @@ def __init__(self, var):
     def fill(self, val):
         """Fills this scalar field with a specified value."""
         if in_python_scope():
-            from taichi._kernels import fill_tensor  # pylint: disable=C0415
+            from taichi._kernels import fill_field  # pylint: disable=C0415
 
-            fill_tensor(self, val)
+            fill_field(self, val)
         else:
             from taichi._funcs import field_fill_taichi_scope  # pylint: disable=C0415