diff --git a/check_curl.sh b/check_curl.sh
index d91384f..fa586ed 100755
--- a/check_curl.sh
+++ b/check_curl.sh
@@ -411,7 +411,8 @@ fi
 BODY_CONTAINS=" "
 if [ -n "$CRIT_STRING" ]; then
   BODY=$(curl -s $FOLLOW_REDIRECTS $INSECURE $HEADERS $RESOLVE $TIMEOUT $URL)
-  if ! [[ $BODY =~ $CRIT_STRING ]]; then
+  # shellcheck disable=SC2076
+  if ! [[ $BODY =~ "$CRIT_STRING" ]]; then
   # if ! echo "$BODY" | grep -q "$CRIT_STRING"; then
     echo "CRITICAL - response body does not contain '$CRIT_STRING': $BODY"
     exit 2