diff --git a/configure.in b/configure.in
index 0646e498b78e..4cccecd54f80 100644
--- a/configure.in
+++ b/configure.in
@@ -8205,11 +8205,6 @@ MOZ_ARG_ENABLE_BOOL(libxul,
     MOZ_ENABLE_LIBXUL=1,
     MOZ_ENABLE_LIBXUL=)
 
-# split JS out by default to avoid VS2005 PGO crash (bug 591836).
-if test "$OS_ARCH" = "WINNT"; then
-  ENABLE_SHARED_JS=1
-fi
-
 MOZ_ARG_ENABLE_BOOL(shared-js,
 [  --enable-shared-js
                           Create a shared JavaScript library.],