diff --git a/bin/git-abort b/bin/git-abort
index 3287839..19b544a 100755
--- a/bin/git-abort
+++ b/bin/git-abort
@@ -4,7 +4,6 @@ set -euo pipefail
 
 # git rev-parse emits an error if not in a git repo so only need to bail out
 gitdir="$(git rev-parse --git-dir)" || exit
-readonly gitdir
 
 discover_op() {
   local op