diff --git a/ci/request-reviews/process-reviewers.sh b/ci/request-reviews/process-reviewers.sh
index 52c0dca0b5594..de969c5c9e4f0 100755
--- a/ci/request-reviews/process-reviewers.sh
+++ b/ci/request-reviews/process-reviewers.sh
@@ -24,7 +24,7 @@ trap 'rm -rf "$tmp"' exit
 
 declare -A users=()
 while read -r handle && [[ -n "$handle" ]]; do
-    users[$handle]=
+    users[${handle,,}]=
 done
 
 # Cannot request a review from the author