diff --git a/starboard.go b/starboard.go
index 86d0b4a..98d7dbc 100644
--- a/starboard.go
+++ b/starboard.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/bwmarrin/discordgo"
@@ -11,6 +12,8 @@ import (
 const starEmoji = "⭐"
 const starChannel = "645551408283648000"
 
+var starboardMutex sync.Mutex
+
 func listenToStarboardReact(s *discordgo.Session, m *discordgo.MessageReactionAdd) {
 	if m.ChannelID == starChannel {
 		return
@@ -26,6 +29,12 @@ func listenToStarboardReact(s *discordgo.Session, m *discordgo.MessageReactionAd
 	if time.Now().Sub(messageTimestamp) > 24*time.Hour {
 		return
 	}
+	starboardMutex.Lock()
+	defer starboardMutex.Unlock()
+
+	if checkStarredBefore(s, m.MessageID) {
+		return
+	}
 
 	reacter, err := s.MessageReactions(m.ChannelID, m.MessageID, starEmoji, 5)
 	if err != nil {
@@ -78,7 +87,25 @@ func listenToStarboardReact(s *discordgo.Session, m *discordgo.MessageReactionAd
 		return
 	}
 	err = s.MessageReactionAdd(msg.ChannelID, msg.ID, starEmoji)
+	noteStarred(s, msg.ID)
 	if err != nil {
 		logError(s, "listenToStarboardReact", "messageReactionAdd", err)
 	}
 }
+
+func checkStarredBefore(s *discordgo.Session, discordID string) bool {
+	rows, err := db.Query("SELECT id FROM starred WHERE id=?", discordID)
+	if err != nil {
+		logError(s, "checkStarredBefore", "query", err)
+		return true
+	}
+	defer rows.Close()
+	return rows.Next()
+}
+
+func noteStarred(s *discordgo.Session, discordID string) {
+	_, err := db.Exec("INSERT INTO starred(id) VALUES(?)", discordID)
+	if err != nil {
+		logError(s, "noteStarred", "exec", err)
+	}
+}