diff --git a/CMakeLists.txt b/CMakeLists.txt
index 38fd91d..fd9f66b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,8 +4,8 @@ project(anthem CXX)
 option(ANTHEM_BUILD_TESTS "Build unit tests" OFF)
 option(ANTHEM_BUILD_STATIC "Build static binaries" OFF)
 
-set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wpedantic")
-set(CMAKE_CXX_FLAGS_DEBUG "-g")
+set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wpedantic ${CMAKE_CXX_FLAGS}")
+set(CMAKE_CXX_FLAGS_DEBUG "-g ${CMAKE_CXX_FLAGS_DEBUG}")
 
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)