diff --git a/src/libslic3r/AppConfig.cpp b/src/libslic3r/AppConfig.cpp
index 23c6037c5..6cfd203b9 100644
--- a/src/libslic3r/AppConfig.cpp
+++ b/src/libslic3r/AppConfig.cpp
@@ -1107,7 +1107,8 @@ void AppConfig::set_recent_projects(const std::vector<std::string>& recent_proje
     for (unsigned int i = 0; i < (unsigned int)recent_projects.size(); ++i)
     {
         auto n = std::to_string(i + 1);
-        if (n.length() == 1) n = "0" + n;
+        if (n.length() == 1) n = "00" + n;
+        else if (n.length() == 2) n = "0" + n;
         it->second[n] = recent_projects[i];
     }
 }
diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index d533b622d..3d73e2a68 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -3213,7 +3213,7 @@ void MainFrame::init_menubar_as_editor()
 
 void MainFrame::set_max_recent_count(int max)
 {
-    max = max < 0 ? 0 : max > 10000 ? 10000 : max;
+    max = max < 0 ? 0 : max > 999 ? 999 : max;
     size_t count = m_recent_projects.GetCount();
     m_recent_projects.SetMaxFiles(max);
     if (count != m_recent_projects.GetCount()) {