diff --git a/CMakeLists.txt b/CMakeLists.txt
index cda8105..b766ec2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,15 +52,15 @@ set(CMAKE_CXX_STANDARD 14)
 
 if((CMAKE_C_COMPILER_ID STREQUAL "GNU") OR
    (CMAKE_C_COMPILER_ID MATCHES "Clang" AND CMAKE_C_COMPILER_FRONTEND_VARIANT STREQUAL "GNU"))
-    set(CMAKE_C_FLAGS "-Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -Wno-unused-parameter -fno-strict-aliasing")
-    set(CMAKE_C_FLAGS_DEBUG "-g")
-    set(CMAKE_C_FLAGS_RELEASE "-O2")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -Wno-unused-parameter -fno-strict-aliasing")
+    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS}")
+    set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS}")
 endif()
 if((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") OR
    (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "GNU"))
     set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-unused-parameter -fno-strict-aliasing")
-    set(CMAKE_CXX_FLAGS_DEBUG "-g")
-    set(CMAKE_CXX_FLAGS_RELEASE "-O2")
+    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_C_FLAGS}")
+    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_C_FLAGS}")
 endif()
 
 if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")