diff --git a/src/mastoapi.cpp b/src/mastoapi.cpp
index fd11959..f7ae1ed 100644
--- a/src/mastoapi.cpp
+++ b/src/mastoapi.cpp
@@ -27,7 +27,7 @@ namespace mastorss
 using std::string;
 using std::string_view;
 
-MastoAPI::MastoAPI(const ProfileData &data)
+MastoAPI::MastoAPI(ProfileData &data)
     : _profile{data}
     , _masto{_profile.instance, _profile.access_token}
 {
@@ -116,5 +116,11 @@ void MastoAPI::post_item(const Item &item)
         throw MastodonException{ret.error_code};
     }
     BOOST_LOG_TRIVIAL(debug) << "Posted status with GUID: " << item.guid;
+
+    _profile.guids.push_back(item.guid);
+    if (_profile.guids.size() > _max_guids)
+    {
+        _profile.guids.pop_front();
+    }
 }
 } // namespace mastorss
diff --git a/src/mastoapi.hpp b/src/mastoapi.hpp
index 6b9a041..d0cde7a 100644
--- a/src/mastoapi.hpp
+++ b/src/mastoapi.hpp
@@ -27,13 +27,14 @@ namespace mastorss
 class MastoAPI
 {
 public:
-    explicit MastoAPI(const ProfileData &data);
+    explicit MastoAPI(ProfileData &data);
 
     void post_item(const Item &item);
 
 private:
-    const ProfileData &_profile;
+    ProfileData &_profile;
     Mastodon::API _masto;
+    constexpr static size_t _max_guids{100};
 };
 } // namespace mastorss