diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6f2553a8..f1e27023 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,6 +24,11 @@ endif()
 if(MSVC)
 	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /MP")
 	set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /MP")
+	if(MEGA_X86)
+		# This prevents usage of SSE2.
+		set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /arch:IA32")
+		set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /arch:IA32")
+	endif()
 	message(STATUS "CMAKE_CXX_FLAGS_RELEASE: ${CMAKE_CXX_FLAGS_RELEASE}")
 	message(STATUS "CMAKE_C_FLAGS_RELEASE: ${CMAKE_C_FLAGS_RELEASE}")
 endif()