diff --git a/spectre-meltdown-checker.sh b/spectre-meltdown-checker.sh
index f71deb5..344c19c 100755
--- a/spectre-meltdown-checker.sh
+++ b/spectre-meltdown-checker.sh
@@ -94,6 +94,8 @@ nrpe_critical=0
 nrpe_unknown=0
 nrpe_vuln=""
 
+ret=0
+
 __echo()
 {
 	opt="$1"
@@ -365,6 +367,9 @@ pvulnstatus()
 		VULN) pstatus red 'VULNERABLE' "$@";;
 		OK) pstatus green 'NOT VULNERABLE' "$@";;
 	esac
+	case "$vulnstatus" in
+		UNK|VULN) ret=1
+	esac
 }
 
 
@@ -980,3 +985,5 @@ fi
 if [ "$opt_batch" = 1 -a "$opt_batch_format" = "json" ]; then
 	_echo 0 ${json_output%?}]
 fi
+
+exit $ret