diff --git a/src/components/status/status.js b/src/components/status/status.js
index 9e18fe15..7f25f1be 100644
--- a/src/components/status/status.js
+++ b/src/components/status/status.js
@@ -49,6 +49,16 @@ const Status = {
         ? this.$store.state.instance.collapseMessageWithSubject
         : this.$store.state.config.collapseMessageWithSubject
     },
+    isLocal () {
+      if (this.status.is_local !== null) {
+        return this.status.is_local
+      } else {
+        const server = this.$store.state.instance.server
+        const windowDomain = window.location.origin
+        return this.status.external_url.startsWith(server) ||
+          this.status.external_url.startsWith(windowDomain)
+      }
+    },
     muteWords () {
       return this.$store.state.config.muteWords
     },
diff --git a/src/components/status/status.vue b/src/components/status/status.vue
index 1f6d0325..91792c50 100644
--- a/src/components/status/status.vue
+++ b/src/components/status/status.vue
@@ -49,7 +49,7 @@
                 <div class="button-icon visibility-icon" v-if="status.visibility">
                   <i :class="visibilityIcon(status.visibility)" :title="status.visibility | capitalize"></i>
                 </div>
-                <a :href="status.external_url" target="_blank" v-if="!status.is_local && !isPreview" class="source_url" title="Source">
+                <a :href="status.external_url" target="_blank" v-if="!isLocal && !isPreview" class="source_url" title="Source">
                   <i class="button-icon icon-link-ext-alt"></i>
                 </a>
                 <template v-if="expandable && !isPreview">
diff --git a/src/services/entity_normalizer/entity_normalizer.service.js b/src/services/entity_normalizer/entity_normalizer.service.js
index d20ce77f..771afac3 100644
--- a/src/services/entity_normalizer/entity_normalizer.service.js
+++ b/src/services/entity_normalizer/entity_normalizer.service.js
@@ -180,7 +180,7 @@ export const parseStatus = (data) => {
     output.external_url = data.url
 
     // FIXME missing!!
-    output.is_local = false
+    output.is_local = null
   } else {
     output.favorited = data.favorited
     output.fave_num = data.fave_num