diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4d92e0886fef..900032617a26 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,11 +27,6 @@ else()
   list(APPEND ZIG_CMAKE_PREFIX_PATH "${ZIG_CMAKE_PREFIX_PATH_STRING}")
 endif()
 
-set(CMAKE_USER_MAKE_RULES_OVERRIDE
-   ${CMAKE_CURRENT_SOURCE_DIR}/cmake/c_flag_overrides.cmake)
-set(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX
-   ${CMAKE_CURRENT_SOURCE_DIR}/cmake/cxx_flag_overrides.cmake)
-
 project(zig C CXX)
 set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
 
diff --git a/cmake/c_flag_overrides.cmake b/cmake/c_flag_overrides.cmake
deleted file mode 100644
index c3225d2c4792..000000000000
--- a/cmake/c_flag_overrides.cmake
+++ /dev/null
@@ -1,13 +0,0 @@
-if(MSVC)
-    set(CMAKE_C_FLAGS_DEBUG_INIT
-        "/D_DEBUG /MTd /Zi /Ob0 /Od /RTC1")
-
-    set(CMAKE_C_FLAGS_MINSIZEREL_INIT
-        "/MT /O1 /Ob1 /D NDEBUG")
-
-    set(CMAKE_C_FLAGS_RELEASE_INIT
-        "/MT /O2 /Ob1 /D NDEBUG")
-
-    set(CMAKE_C_FLAGS_RELWITHDEBINFO_INIT
-        "/MT /Zi /O2 /Ob1 /D NDEBUG")
-endif()
diff --git a/cmake/cxx_flag_overrides.cmake b/cmake/cxx_flag_overrides.cmake
deleted file mode 100644
index 2f5473df93e1..000000000000
--- a/cmake/cxx_flag_overrides.cmake
+++ /dev/null
@@ -1,13 +0,0 @@
-if(MSVC)
-    set(CMAKE_CXX_FLAGS_DEBUG_INIT
-        "/D_DEBUG /MTd /Zi /Ob0 /Od /RTC1")
-
-    set(CMAKE_CXX_FLAGS_MINSIZEREL_INIT
-        "/MT /O1 /Ob1 /D NDEBUG")
-
-    set(CMAKE_CXX_FLAGS_RELEASE_INIT
-        "/MT /O2 /Ob1 /D NDEBUG")
-
-    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT
-        "/MT /Zi /O2 /Ob1 /D NDEBUG")
-endif()