diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
index c0910735..9a825d29 100644
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
@@ -100,7 +100,7 @@ val httpSignaturePlugin = createClientPlugin("HttpSign",::HttpSignaturePluginCon
                 }
             }
 
-            val builder = HttpMessageSigner.builder().algorithm(algorithmType).keyId(keyId).keyMap(keyMap)
+            val builder = HttpMessageSigner.builder().algorithm(algorithmType).keyId("${Config.configData.url}/users/$keyId/pubkey").keyMap(keyMap)
             var tmp = builder
             headers.forEach {
                 tmp = tmp.addHeaderToSign(it)
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/ActivityPubUserService.kt b/src/main/kotlin/dev/usbharu/hideout/service/ActivityPubUserService.kt
index d4f9d18c..081f0366 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/ActivityPubUserService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/ActivityPubUserService.kt
@@ -50,6 +50,7 @@ class ActivityPubUserService(
         val inboxUrl = person.inbox ?: throw IllegalArgumentException("inbox is not found")
         httpClient.post(inboxUrl) {
             contentType(ContentType.Application.Activity)
+            header("Signature","keyId=\"${person.preferredUsername}\",algorithm=\"rsa-sha256\",headers=\"(request-target) host date\"")
             setBody(Accept(
                     name = "Follow",
                     `object` = follow,