diff --git a/indra/cmake/00-Common.cmake b/indra/cmake/00-Common.cmake
index 98eeed09b3a7448bbf504dadb27a80bbce469f16..00baf626d20a86f37ffcbf0ec902f675eda24156 100644
--- a/indra/cmake/00-Common.cmake
+++ b/indra/cmake/00-Common.cmake
@@ -69,6 +69,7 @@ if (WINDOWS)
       /Oy-
       /Zc:wchar_t-
       /arch:SSE2
+      /fp:fast
       )
      
   # Are we using the crummy Visual Studio KDU build workaround?