diff --git a/webrtc/modules/desktop_capture/win/window_capture_utils.cc b/webrtc/modules/desktop_capture/win/window_capture_utils.cc
index c878a63cd..03e021954 100644
--- a/webrtc/modules/desktop_capture/win/window_capture_utils.cc
+++ b/webrtc/modules/desktop_capture/win/window_capture_utils.cc
@@ -21,6 +21,7 @@ GetCroppedWindowRect(HWND window,
     return false;
   }
   WINDOWPLACEMENT window_placement;
+  window_placement.length = sizeof(window_placement);
   if (!GetWindowPlacement(window, &window_placement)) {
     return false;
   }