--- a/widget/gtk/nsWindow.cpp
+++ b/widget/gtk/nsWindow.cpp
@@ -1039,17 +1039,23 @@ void nsWindow::SetSizeConstraints(const 
                              mSizeConstraints.mMinSize.width);
         geometry.min_height = DevicePixelsToGdkCoordRoundUp(
                               mSizeConstraints.mMinSize.height);
         geometry.max_width = DevicePixelsToGdkCoordRoundDown(
                              mSizeConstraints.mMaxSize.width);
         geometry.max_height = DevicePixelsToGdkCoordRoundDown(
                               mSizeConstraints.mMaxSize.height);
 
-        uint32_t hints = GDK_HINT_MIN_SIZE | GDK_HINT_MAX_SIZE;
+        uint32_t hints = 0;
+        if (aConstraints.mMinSize != LayoutDeviceIntSize(0, 0)) {
+          hints |= GDK_HINT_MIN_SIZE;
+        }
+        if (aConstraints.mMaxSize != LayoutDeviceIntSize(NS_MAXSIZE, NS_MAXSIZE)) {
+          hints |= GDK_HINT_MAX_SIZE;
+        }
         gtk_window_set_geometry_hints(GTK_WINDOW(mShell), nullptr,
                                       &geometry, GdkWindowHints(hints));
     }
 }
 
 NS_IMETHODIMP
 nsWindow::Show(bool aState)
 {