diff --git a/reactos/cmake/config.cmake b/reactos/cmake/config.cmake
index 1f281b275c0..d3619a524a0 100644
--- a/reactos/cmake/config.cmake
+++ b/reactos/cmake/config.cmake
@@ -10,7 +10,7 @@ set(OARCH "pentium" CACHE STRING
 set(TUNE "i686" CACHE STRING
 "Which CPU ReactOS should be optimized for.")
 
-set(OPTIMIZE "1" CACHE STRING
+set(OPTIMIZE "4" CACHE STRING
 "What level of optimization to use.
  0 = off
  1 = Default option, optimize for size (-Os) with some additional options