diff --git a/modules/desktop_capture/win/wgc_capture_session.cc b/modules/desktop_capture/win/wgc_capture_session.cc
index f024349..dc744d4 100644
--- a/modules/desktop_capture/win/wgc_capture_session.cc
+++ b/modules/desktop_capture/win/wgc_capture_session.cc
@@ -583,6 +583,15 @@
         // Mark resized frames as damaged.
         damage_region_.SetRect(DesktopRect::MakeSize(current_frame->size()));
       }
+    } else{
+      // Mark a `damage_region_` even if there is no previous frame. This
+      // condition does not create any increased overhead but is useful while
+      // using FullScreenWindowDetector, where it would create a new
+      // WgcCaptureSession(with no previous frame) for the slide show window but
+      // the DesktopCaptureDevice instance might have already received frames
+      // from the editor window's WgcCaptureSession which would have activated
+      // the zero-hertz mode.
+      damage_region_.SetRect(DesktopRect::MakeSize(current_frame->size()));
     }
   }