diff --git a/Libraries/LibCore/CMakeLists.txt b/Libraries/LibCore/CMakeLists.txt
index 5ed2c0bc62a..d3136184d5b 100644
--- a/Libraries/LibCore/CMakeLists.txt
+++ b/Libraries/LibCore/CMakeLists.txt
@@ -114,3 +114,7 @@ endif()
 if (ANDROID)
     target_link_libraries(LibCore PRIVATE log)
 endif()
+
+if (WIN32)
+    target_include_directories(LibCore PRIVATE ${MMAN_INCLUDE_DIR})
+endif()
diff --git a/Libraries/LibCore/MappedFile.cpp b/Libraries/LibCore/MappedFile.cpp
index 3660c2c9e32..c8d45a88f6a 100644
--- a/Libraries/LibCore/MappedFile.cpp
+++ b/Libraries/LibCore/MappedFile.cpp
@@ -9,9 +9,7 @@
 #include <LibCore/File.h>
 #include <LibCore/MappedFile.h>
 #include <LibCore/System.h>
-#include <fcntl.h>
 #include <sys/mman.h>
-#include <unistd.h>
 
 namespace Core {
 
@@ -30,7 +28,7 @@ ErrorOr<NonnullOwnPtr<MappedFile>> MappedFile::map_from_file(NonnullOwnPtr<Core:
 ErrorOr<NonnullOwnPtr<MappedFile>> MappedFile::map_from_fd_and_close(int fd, [[maybe_unused]] StringView path, Mode mode)
 {
     ScopeGuard fd_close_guard = [fd] {
-        ::close(fd);
+        (void)System::close(fd);
     };
 
     auto stat = TRY(Core::System::fstat(fd));