diff --git a/CMakeLists.txt b/CMakeLists.txt
index f92363e7..c8638757 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -237,9 +237,9 @@ ENDIF ()
 
 IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
     IF (MSGPACK_ENABLE_SHARED)
-        SET_PROPERTY (TARGET msgpackc APPEND_STRING PROPERTY COMPILE_FLAGS "-Wall -Wextra -Werror -g -O3 -DPIC")
+        SET_PROPERTY (TARGET msgpackc APPEND_STRING PROPERTY COMPILE_FLAGS "-Wall -Wextra -DPIC")
     ENDIF ()
-    SET_PROPERTY (TARGET msgpackc-static APPEND_STRING PROPERTY COMPILE_FLAGS "-Wall -Wextra -Werror -g -O3" )
+    SET_PROPERTY (TARGET msgpackc-static APPEND_STRING PROPERTY COMPILE_FLAGS "-Wall -Wextra" )
 ENDIF ()
 
 IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")