diff --git a/src/PIL/GimpPaletteFile.py b/src/PIL/GimpPaletteFile.py
index 87b12a2ab..7d08bab07 100644
--- a/src/PIL/GimpPaletteFile.py
+++ b/src/PIL/GimpPaletteFile.py
@@ -18,8 +18,6 @@ import re
 
 from ._binary import o8
 
-_str_to_o8 = lambda v: o8(int(v))
-
 
 class GimpPaletteFile:
     """File handler for GIMP's palette format."""