diff --git a/Kernel/CMakeLists.txt b/Kernel/CMakeLists.txt
index 8f9d6ec94f4..c107f0583a3 100644
--- a/Kernel/CMakeLists.txt
+++ b/Kernel/CMakeLists.txt
@@ -300,13 +300,19 @@ foreach(flag IN LISTS KERNEL_FSANITIZE_FLAGS)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=${flag}")
 endforeach()
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option -DKERNEL")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pie -fPIE -fno-rtti -ffreestanding -fbuiltin")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mno-80387 -mno-mmx -mno-sse -mno-sse2")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-asynchronous-unwind-tables")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstack-protector-strong")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nostdlib -nostdinc -nostdinc++")
 
+add_compile_definitions(KERNEL)
+
+# HACK: This is a workaround for CLion to grok the kernel sources.
+#       It's needed because CLion doesn't understand the way we switch compilers mid-build.
+add_compile_definitions(__serenity__)
+
 add_link_options(LINKER:-T ${CMAKE_CURRENT_BINARY_DIR}/linker.ld -nostdlib)
 
 add_library(boot OBJECT Arch/i386/Boot/boot.S)