diff --git a/src/bee-cache.sh.in b/src/bee-cache.sh.in
index b1e2b2e..243844d 100644
--- a/src/bee-cache.sh.in
+++ b/src/bee-cache.sh.in
@@ -36,7 +36,7 @@ VERSION=${BEE_VERSION}
 : ${BEECACHE_INVENTORY=${BEECACHE_CACHEDIR}/INVENTORY}
 
 function ere_quote() {
-    sed 's/[]\.|$(){}?+*^]/\\&/g' <<< "$*"
+    sed 's/[][\.|$(){}?+*^]/\\&/g' <<< "$*"
 }
 
 function cache_verify() {