diff --git a/modules/desktop_capture/differ_block.cc b/modules/desktop_capture/differ_block.cc
index 54ee0829ea..c51d33e41e 100644
--- a/modules/desktop_capture/differ_block.cc
+++ b/modules/desktop_capture/differ_block.cc
@@ -12,10 +12,15 @@
 
 #include <string.h>
 
-#include "modules/desktop_capture/differ_vector_sse2.h"
 #include "rtc_base/system/arch.h"
 #include "system_wrappers/include/cpu_features_wrapper.h"
 
+// This needs to be after rtc_base/system/arch.h which defines
+// architecture macros.
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+#include "modules/desktop_capture/differ_vector_sse2.h"
+#endif
+
 namespace webrtc {
 
 namespace {