diff --git a/pandas/core/generic.py b/pandas/core/generic.py
index 20d8bd3bda21f..21b8663a7cdee 100644
--- a/pandas/core/generic.py
+++ b/pandas/core/generic.py
@@ -9622,8 +9622,7 @@ def _where(
                 raise ValueError("Array conditional must be same shape as self")
             cond = self._constructor(cond, **self._construct_axes_dict(), copy=False)
 
-        # make sure we are boolean
-        fill_value = bool(inplace)
+        fill_value = False
         cond = cond.fillna(fill_value)
         cond = cond.infer_objects()
 
diff --git a/pandas/tests/frame/indexing/test_where.py b/pandas/tests/frame/indexing/test_where.py
index aeffc4835a347..b9edbcd10a783 100644
--- a/pandas/tests/frame/indexing/test_where.py
+++ b/pandas/tests/frame/indexing/test_where.py
@@ -1064,3 +1064,23 @@ def test_where_inplace_no_other():
     df.where(cond, inplace=True)
     expected = DataFrame({"a": [1, np.nan], "b": [np.nan, "y"]})
     tm.assert_frame_equal(df, expected)
+
+
+def test_where_consistent_inplace():
+    # GH#57083
+    s = Series(range(5))
+    t = Series([True, False])
+    expected_where = Series([0, 99, 99, 99, 99])
+    # where
+    w = s.where(t, 99)
+    tm.assert_series_equal(w, expected_where)
+    w_inplace = s.copy()
+    w_inplace.where(t, 99, inplace=True)
+    tm.assert_series_equal(w_inplace, expected_where)
+    # mask
+    expected_mask = Series([99, 1, 99, 99, 99])
+    m = s.mask(t, 99)
+    tm.assert_series_equal(m, expected_mask)
+    m_inplace = s.copy()
+    m_inplace.mask(t, 99, inplace=True)
+    tm.assert_series_equal(m_inplace, expected_mask)