diff --git a/app/src/main/java/jp/juggler/subwaytooter/action/Action_Reaction.kt b/app/src/main/java/jp/juggler/subwaytooter/action/Action_Reaction.kt
index e0a5863c..48db0db2 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/action/Action_Reaction.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/action/Action_Reaction.kt
@@ -71,7 +71,7 @@ fun ActMain.reactionAdd(
         } else when (domain) {
             null, "", ".", access_info.apDomain.ascii -> {
                 // normalize to local custom emoji
-                code = name
+                code = ":$name:"
             }
 
             else -> {