diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
index f2cbf6cc..24a4acd9 100644
--- a/kernel/CMakeLists.txt
+++ b/kernel/CMakeLists.txt
@@ -7,13 +7,13 @@ set(SOURCES
 )
 
 if("${ARCH}" MATCHES "x86_64")
-set(SOURCES
-    ${SOURCES}
-    src/arch/x86_64/IO.cpp
-    src/arch/x86_64/Serial.cpp
-    src/arch/x86_64/MMU.cpp
-    src/arch/x86_64/CPU.cpp
-)
+    set(SOURCES
+        ${SOURCES}
+        src/arch/x86_64/IO.cpp
+        src/arch/x86_64/Serial.cpp
+        src/arch/x86_64/MMU.cpp
+        src/arch/x86_64/CPU.cpp
+    )
 endif()
 
 add_executable(moon ${SOURCES})