diff --git a/Tests/test_imagefont.py b/Tests/test_imagefont.py
index c50447a153d..02622e72138 100644
--- a/Tests/test_imagefont.py
+++ b/Tests/test_imagefont.py
@@ -1040,21 +1040,21 @@ def test_render_mono_size():
 
 def test_too_many_characters(font):
     with pytest.raises(ValueError):
-        font.getlength("A" * 1000001)
+        font.getlength("A" * 1_000_001)
     with pytest.raises(ValueError):
-        font.getbbox("A" * 1000001)
+        font.getbbox("A" * 1_000_001)
     with pytest.raises(ValueError):
-        font.getmask2("A" * 1000001)
+        font.getmask2("A" * 1_000_001)
 
     transposed_font = ImageFont.TransposedFont(font)
     with pytest.raises(ValueError):
-        transposed_font.getlength("A" * 1000001)
+        transposed_font.getlength("A" * 1_000_001)
 
     default_font = ImageFont.load_default()
     with pytest.raises(ValueError):
-        default_font.getlength("A" * 1000001)
+        default_font.getlength("A" * 1_000_001)
     with pytest.raises(ValueError):
-        default_font.getbbox("A" * 1000001)
+        default_font.getbbox("A" * 1_000_001)
 
 
 @pytest.mark.parametrize(
diff --git a/src/PIL/ImageFont.py b/src/PIL/ImageFont.py
index 1030985ebc4..b7d40208c83 100644
--- a/src/PIL/ImageFont.py
+++ b/src/PIL/ImageFont.py
@@ -41,7 +41,7 @@ class Layout(IntEnum):
     RAQM = 1
 
 
-MAX_STRING_LENGTH = 1000000
+MAX_STRING_LENGTH = 1_000_000
 
 
 try: