diff --git a/iOS/PostEditor/PostEditorView.swift b/iOS/PostEditor/PostEditorView.swift
index d866cc7..92c4e06 100644
--- a/iOS/PostEditor/PostEditorView.swift
+++ b/iOS/PostEditor/PostEditorView.swift
@@ -207,11 +207,13 @@ struct PostEditorView: View {
 
         if let postSlug = post.slug,
            let postCollectionAlias = post.collectionAlias {
-            // This post is in a collection, so share the URL as server/collectionAlias/postSlug.
-            urlString = "\(model.account.server)/\((postCollectionAlias))/\((postSlug))"
+            // This post is in a collection, so share the URL as baseURL/postSlug.
+            let urls = collections.filter { $0.alias == postCollectionAlias }
+            let baseURL = urls.first?.url ?? "\(model.account.server)/\(postCollectionAlias)/"
+            urlString = "\(baseURL)\(postSlug)"
         } else {
             // This is a draft post, so share the URL as server/postID
-            urlString = "\(model.account.server)/\((postId))"
+            urlString = "\(model.account.server)/\(postId)"
         }
 
         guard let data = URL(string: urlString) else { return }
diff --git a/macOS/Navigation/ActivePostToolbarView.swift b/macOS/Navigation/ActivePostToolbarView.swift
index f95d123..1319400 100644
--- a/macOS/Navigation/ActivePostToolbarView.swift
+++ b/macOS/Navigation/ActivePostToolbarView.swift
@@ -106,9 +106,20 @@ struct ActivePostToolbarView: View {
 
     private func createPostUrl() -> [Any] {
         guard let postId = model.selectedPost?.postId else { return [] }
-        guard let urlString = model.selectedPost?.slug != nil ?
-                "\(model.account.server)/\((model.selectedPost?.collectionAlias)!)/\((model.selectedPost?.slug)!)" :
-                "\(model.account.server)/\((postId))" else { return [] }
+
+        var urlString: String
+
+        if let postSlug = model.selectedPost?.slug,
+           let postCollectionAlias = model.selectedPost?.collectionAlias {
+            // This post is in a collection, so share the URL as baseURL/postSlug
+            let urls = collections.filter { $0.alias == postCollectionAlias }
+            let baseURL = urls.first?.url ?? "\(model.account.server)/\(postCollectionAlias)/"
+            urlString = "\(baseURL)\(postSlug)"
+        } else {
+            // This is a draft post, sho share the URL as server/postID
+            urlString = "\(model.account.server)/\(postId)"
+        }
+
         guard let data = URL(string: urlString) else { return [] }
         return [data as NSURL]
     }