diff --git a/rich/cells.py b/rich/cells.py
index af8e81c7b..4debea0ca 100644
--- a/rich/cells.py
+++ b/rich/cells.py
@@ -8,7 +8,7 @@
 
 # Regex to match sequence of the most common character ranges
 _is_single_cell_widths = re.compile(
-    "^[\u0020-\u007f\u00a0\u02ff\u0370-\u0482\u2500-\u25FF]*$"
+    "^[\u0020-\u007e\u00a0\u02ff\u0370-\u0482\u2500-\u25FF]*$"
 ).match
 
 
diff --git a/tests/test_cells.py b/tests/test_cells.py
index fe451fa57..d694fb379 100644
--- a/tests/test_cells.py
+++ b/tests/test_cells.py
@@ -1,5 +1,7 @@
+import string
+
 from rich import cells
-from rich.cells import chop_cells
+from rich.cells import _is_single_cell_widths, chop_cells
 
 
 def test_cell_len_long_string():
@@ -59,3 +61,22 @@ def test_chop_cells_mixed_width():
     """Mixed single and double-width characters."""
     text = "あ1り234が5と6う78"
     assert chop_cells(text, 3) == ["あ1", "り2", "34", "が5", "と6", "う7", "8"]
+
+
+def test_is_single_cell_widths() -> None:
+    # Check _is_single_cell_widths reports correctly
+    for character in string.printable:
+        if ord(character) >= 32:
+            assert _is_single_cell_widths(character)
+
+    BOX = "┌─┬┐│ ││├─┼┤│ ││├─┼┤├─┼┤│ ││└─┴┘"
+
+    for character in BOX:
+        print(repr(character))
+        assert _is_single_cell_widths(character)
+
+    for character in "💩":
+        assert not _is_single_cell_widths(character)
+
+    for character in "わさび":
+        assert not _is_single_cell_widths(character)
diff --git a/tests/test_segment.py b/tests/test_segment.py
index a9e649410..2264dbe50 100644
--- a/tests/test_segment.py
+++ b/tests/test_segment.py
@@ -1,16 +1,9 @@
-import string
 from io import StringIO
 
 import pytest
 
 from rich.cells import cell_len
-from rich.segment import (
-    ControlType,
-    Segment,
-    SegmentLines,
-    Segments,
-    _is_single_cell_widths,
-)
+from rich.segment import ControlType, Segment, SegmentLines, Segments
 from rich.style import Style
 
 
@@ -385,22 +378,3 @@ def test_align_bottom():
         [Segment("   ", Style())],
         [Segment("X")],
     ]
-
-
-def test_is_single_cell_widths() -> None:
-    # Check _is_single_cell_widths reports correctly
-    for character in string.printable:
-        if ord(character) >= 32:
-            assert _is_single_cell_widths(character)
-
-    BOX = "┌─┬┐│ ││├─┼┤│ ││├─┼┤├─┼┤│ ││└─┴┘"
-
-    for character in BOX:
-        print(repr(character))
-        assert _is_single_cell_widths(character)
-
-    for character in "💩":
-        assert not _is_single_cell_widths(character)
-
-    for character in "わさび":
-        assert not _is_single_cell_widths(character)