diff --git a/clapper_src/misc.js b/clapper_src/misc.js
index b1ef3e2f..f03cd9b7 100644
--- a/clapper_src/misc.js
+++ b/clapper_src/misc.js
@@ -12,6 +12,7 @@ var settings = new Gio.Settings({
 });
 
 var maxVolume = 1.5;
+var isOldGtk = (Gtk.MINOR_VERSION === 99 && Gtk.MICRO_VERSION <= 4);
 
 let { debug } = Debug;
 let inhibitCookie;
diff --git a/clapper_src/player.js b/clapper_src/player.js
index 776ed62c..ac5e0035 100644
--- a/clapper_src/player.js
+++ b/clapper_src/player.js
@@ -322,7 +322,10 @@ class ClapperPlayer extends PlayerBase
 
         let clapperWidget = this.widget.get_ancestor(Gtk.Grid);
         if(!clapperWidget.fullscreenMode) {
-            let size = window.get_default_size();
+            let size = (Misc.isOldGtk)
+                ? window.get_size()
+                : window.get_default_size();
+
             if(size[0] > 0 && size[1] > 0)
                 clapperWidget._saveWindowSize(size);
         }
diff --git a/clapper_src/widget.js b/clapper_src/widget.js
index 707174a1..664693dd 100644
--- a/clapper_src/widget.js
+++ b/clapper_src/widget.js
@@ -135,7 +135,9 @@ var Widget = GObject.registerClass({
             return;
 
         let root = this.get_root();
-        let size = root.get_default_size();
+        let size = (Misc.isOldGtk)
+            ? root.get_size()
+            : root.get_default_size();
 
         this._saveWindowSize(size);
 
@@ -160,7 +162,11 @@ var Widget = GObject.registerClass({
             ? this.floatSize
             : this.windowSize;
 
-        root.set_default_size(resize[0], resize[1]);
+        if(Misc.isOldGtk)
+            root.resize(resize[0], resize[1]);
+        else
+            root.set_default_size(resize[0], resize[1]);
+
         debug(`resized window: ${resize[0]}x${resize[1]}`);
 
         this.revealerBottom.showChild(false);