diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index c01cf45c..e2760f5f 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -6,8 +6,6 @@ if(POLICY CMP0167)
     cmake_policy(SET CMP0167 NEW)
 endif()
 project(libloot VERSION "0.27.0")
-include(ExternalProject)
-include(FetchContent)
 include(CMakeDependentOption)
 include(CMakePackageConfigHelpers)
 include(GNUInstallDirs)
@@ -25,10 +23,6 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-if(MSVC)
-    add_compile_options("/MP")
-endif()
-
 ##############################
 # External Projects
 ##############################
@@ -191,7 +185,7 @@ endif()
 
 if(MSVC)
     # Turn off permissive mode to be more standards-compliant and avoid compiler errors.
-    target_compile_options(loot PRIVATE "/permissive-" "/W4" "/Zc:__cplusplus" "/GL")
+    target_compile_options(loot PRIVATE "/permissive-" "/W4" "/Zc:__cplusplus" "/GL" "/MP")
     target_link_options(loot PRIVATE "/LTCG")
 endif()
 
diff --git a/cpp/cmake/tests.cmake b/cpp/cmake/tests.cmake
index 9f05e593..99a23c6d 100644
--- a/cpp/cmake/tests.cmake
+++ b/cpp/cmake/tests.cmake
@@ -102,7 +102,7 @@ endif()
 
 if(MSVC)
     # Turn off permissive mode to be more standards-compliant and avoid compiler errors.
-    target_compile_options(libloot_tests PRIVATE "/Zc:__cplusplus" "/permissive-" "/W4")
+    target_compile_options(libloot_tests PRIVATE "/Zc:__cplusplus" "/permissive-" "/W4" "/MP")
 endif()