diff --git a/docs/Changelog.md b/docs/Changelog.md
index 00ae62b..f85099e 100644
--- a/docs/Changelog.md
+++ b/docs/Changelog.md
@@ -9,6 +9,7 @@
 - Fix long commands causing key bindings not visible in the command palette.
 - Fix script compatibility with mordenx and mpv-osc-tethys.
 - Fix borderless window not resizable with mouse.
+- Fix start-size=session not working.
 
 input.conf changes:
 
diff --git a/src/WinForms/MainForm.cs b/src/WinForms/MainForm.cs
index c2eb8aa..70c72b6 100644
--- a/src/WinForms/MainForm.cs
+++ b/src/WinForms/MainForm.cs
@@ -477,7 +477,7 @@ namespace mpvnet
                     height = windowSize.Height;
                     width = height * videoSize.Width / videoSize.Height;
                 }
-                else if (App.StartSize == "height-session")
+                else if (App.StartSize == "height-session" || App.StartSize == "session")
                 {
                     height = autoFitHeight;
                     width = height * videoSize.Width / videoSize.Height;
@@ -492,7 +492,7 @@ namespace mpvnet
                     width = autoFitHeight / 9 * 16;
                     height = (int)Math.Ceiling(width * videoSize.Height / (double)videoSize.Width);
                 }
-                else if (KeepSize() && windowSize.Height != 0)
+                else if (App.StartSize == "always" && windowSize.Height != 0)
                 {
                     height = windowSize.Height;
                     width = windowSize.Width;