diff --git a/build/CMakeLists.txt b/build/CMakeLists.txt
index b69cc57..a7ab401 100644
--- a/build/CMakeLists.txt
+++ b/build/CMakeLists.txt
@@ -5,7 +5,8 @@ add_compile_definitions(__IPC_LIBRARY__)
 if(MSVC)
   add_compile_options("/std:c++17")
 else()
-  add_compile_options("-std=gnu++1z -O2")
+  add_compile_options("-std=gnu++1z")
+  set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O2")
 endif()
 
 include_directories("../include")