diff --git a/CMakeLists.txt b/CMakeLists.txt
index 621be518..01779ce1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -426,9 +426,9 @@ if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
                 set(VISIBILITY_FLAG -fvisibility=hidden)
     endif()
     if (UNIX)
-		set(CMAKE_C_FLAGS "-Wall -Werror -O3 ${VISIBILITY_FLAG} ${CMAKE_C_FLAGS}" )
+               set(CMAKE_C_FLAGS "-Wall -Werror ${VISIBILITY_FLAG} ${CMAKE_C_FLAGS}" )
     else(UNIX)
-		set(CMAKE_C_FLAGS "-Wall -O3 ${VISIBILITY_FLAG} ${CMAKE_C_FLAGS}" )
+               set(CMAKE_C_FLAGS "-Wall ${VISIBILITY_FLAG} ${CMAKE_C_FLAGS}" )
     endif(UNIX)
 endif ()