diff --git a/git-compat-util.h b/git-compat-util.h
index 0fb51b936b..e0f50a277b 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -699,15 +699,6 @@ static inline size_t st_left_shift(size_t a, unsigned shift)
 	return a << shift;
 }
 
-static inline unsigned long cast_size_t_to_ulong(size_t a)
-{
-	if (a != (unsigned long)a)
-		die("object too large to read on this platform: %"
-		    PRIuMAX" is cut off to %lu",
-		    (uintmax_t)a, (unsigned long)a);
-	return (unsigned long)a;
-}
-
 static inline uint32_t cast_size_t_to_uint32_t(size_t a)
 {
 	if (a != (uint32_t)a)