diff --git a/abra b/abra
index 24a8063..861bb29 100755
--- a/abra
+++ b/abra
@@ -508,8 +508,8 @@ require_apps_json() {
 
   if [ -f "$ABRA_APPS_JSON" ]; then
     modified=$(curl --silent --head "$ABRA_APPS_URL" | \
-             awk '/^Last-Modified/{print $0}' | \
-             sed 's/^Last-Modified: //')
+             awk '/^last-modified/{print tolower($0)}' | \
+             sed 's/^last-modified: //I')
     remote_ctime=$(date --date="$modified" +%s)
     local_ctime=$(stat -c %Z "$ABRA_APPS_JSON")