diff --git a/commands.go b/commands.go
index 3016e04..2ae37cb 100644
--- a/commands.go
+++ b/commands.go
@@ -103,7 +103,7 @@ func getXKCD(s *discordgo.Session, m *discordgo.Message, ctx *mux.Context) {
 	} else {
 		arg = "random"
 	}
-	matchedNum, _ := regexp.MatchString(`[0-9]+`, arg)
+	matchedNum, _ := regexp.MatchString(`^[0-9]+$`, arg)
 	if arg == "latest" {
 		comic, err = xkclient.Latest(context.Background())
 	} else if matchedNum {