diff --git a/modules/desktop_capture/desktop_capturer_differ_wrapper.h b/modules/desktop_capture/desktop_capturer_differ_wrapper.h
index 1c5a621415..1f70cef186 100644
--- a/modules/desktop_capture/desktop_capturer_differ_wrapper.h
+++ b/modules/desktop_capture/desktop_capturer_differ_wrapper.h
@@ -19,6 +19,7 @@
 #include "modules/desktop_capture/desktop_geometry.h"
 #include "modules/desktop_capture/shared_desktop_frame.h"
 #include "modules/desktop_capture/shared_memory.h"
+#include "rtc_base/system/rtc_export.h"
 
 namespace webrtc {
 
@@ -30,8 +31,9 @@ namespace webrtc {
 //
 // This class marks entire frame as updated if the frame size or frame stride
 // has been changed.
-class DesktopCapturerDifferWrapper : public DesktopCapturer,
-                                     public DesktopCapturer::Callback {
+class RTC_EXPORT DesktopCapturerDifferWrapper
+    : public DesktopCapturer,
+      public DesktopCapturer::Callback {
  public:
   // Creates a DesktopCapturerDifferWrapper with a DesktopCapturer
   // implementation, and takes its ownership.