diff --git a/indra/cmake/00-Common.cmake b/indra/cmake/00-Common.cmake
index 66abb6edb..916878ec3 100644
--- a/indra/cmake/00-Common.cmake
+++ b/indra/cmake/00-Common.cmake
@@ -31,10 +31,10 @@ if (WINDOWS)
   # Don't build DLLs.
   set(BUILD_SHARED_LIBS OFF)
 
-  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /Od /Zi /MDd"
+  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /Od /Zi /MDd /arch:SSE2"
       CACHE STRING "C++ compiler debug options" FORCE)
   set(CMAKE_CXX_FLAGS_RELWITHDEBINFO 
-      "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /Od /Zi /MD /MP"
+      "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /Od /Zi /MD /MP /arch:SSE2"
       CACHE STRING "C++ compiler release-with-debug options" FORCE)
   set(CMAKE_CXX_FLAGS_RELEASE
       "${CMAKE_CXX_FLAGS_RELEASE} ${LL_CXX_FLAGS} /O2 /Zi /MD /MP /arch:SSE /fp:fast"