diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7b6a2f0d..d23959dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.5)
 
-project(Irrlicht)
+project(Irrlicht CXX)
 
 set(IRRLICHT_VERSION_MAJOR 1)
 set(IRRLICHT_VERSION_MINOR 9)
diff --git a/source/Irrlicht/CMakeLists.txt b/source/Irrlicht/CMakeLists.txt
index 28301c5b..1bb86a8b 100644
--- a/source/Irrlicht/CMakeLists.txt
+++ b/source/Irrlicht/CMakeLists.txt
@@ -12,9 +12,7 @@ set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
 
 if(CMAKE_CXX_COMPILER_ID MATCHES "^(GNU|Clang|AppleClang)$")
 	set(CMAKE_CXX_FLAGS_RELEASE "-O3")
-	set(CMAKE_C_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE})
 	set(CMAKE_CXX_FLAGS_DEBUG "-g")
-	set(CMAKE_C_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG})
 
 	add_compile_options(-Wall -pipe -fno-exceptions -fno-rtti)
 elseif(MSVC)