diff --git a/CMakeLists.txt b/CMakeLists.txt
index 91a87ebc..f6f98f56 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,6 +21,13 @@ if(MSVC)
     add_compile_options("/utf-8")
 endif()
 
+if(NOT CMAKE_BUILD_TYPE)
+  set(CMAKE_BUILD_TYPE Release)
+endif()
+
+set(CMAKE_CXX_FLAGS_DEBUG "-g")
+set(CMAKE_CXX_FLAGS_RELEASE "-O2")
+
 include_directories(${CMAKE_CURRENT_LIST_DIR}/include)
 
 aux_source_directory(${CMAKE_CURRENT_LIST_DIR}/src POCKETPY_SRC)