diff --git a/modules/desktop_capture/mac/window_list_utils.cc b/modules/desktop_capture/mac/window_list_utils.cc
index 8b668c9..10c12c1 100644
--- a/modules/desktop_capture/mac/window_list_utils.cc
+++ b/modules/desktop_capture/mac/window_list_utils.cc
@@ -141,7 +141,7 @@
 bool IsWindowOnScreen(CFDictionaryRef window) {
   CFBooleanRef on_screen = reinterpret_cast<CFBooleanRef>(
       CFDictionaryGetValue(window, kCGWindowIsOnscreen));
-  return on_screen == NULL || CFBooleanGetValue(on_screen);
+  return on_screen != NULL && CFBooleanGetValue(on_screen);
 }
 
 bool IsWindowOnScreen(CGWindowID id) {
@@ -149,7 +149,7 @@
       CFArrayCreate(NULL, reinterpret_cast<const void **>(&id), 1, NULL);
   CFArrayRef window_array =
       CGWindowListCreateDescriptionFromArray(window_id_array);
-  bool on_screen = true;
+  bool on_screen = false;
 
   if (window_array && CFArrayGetCount(window_array)) {
     on_screen = IsWindowOnScreen(reinterpret_cast<CFDictionaryRef>(
diff --git a/modules/desktop_capture/mac/window_list_utils.h b/modules/desktop_capture/mac/window_list_utils.h
index b4608f6..5e204a7 100644
--- a/modules/desktop_capture/mac/window_list_utils.h
+++ b/modules/desktop_capture/mac/window_list_utils.h
@@ -36,15 +36,12 @@
 bool IsWindowFullScreen(const MacDesktopConfiguration& desktop_config,
                         CFDictionaryRef window);
 
-// TODO(zijiehe): Flip the behaviors of the following two functions when native
-// APIs fail. If |window| does not represent a window, or |id| cannot be found,
-// returning false is more reasonable.
-// Returns true if the |window| is on screen. This function returns true if
+// Returns true if the |window| is on screen. This function returns false if
 // native APIs fail.
 bool IsWindowOnScreen(CFDictionaryRef window);
 
-// Returns true if the window is on screen. This function returns true if native
-// APIs fail or |id| cannot be found.
+// Returns true if the window is on screen. This function returns false if
+// native APIs fail or |id| cannot be found.
 bool IsWindowOnScreen(CGWindowID id);
 
 // Returns utf-8 encoded title of |window|. If |window| is not a window or no