diff --git a/CMakeLists.txt b/CMakeLists.txt
index a649fb7a0..25be443c4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -795,6 +795,7 @@ elseif(WINDOWS)
       ${SDL2_SOURCE_DIR}/src/thread/windows/SDL_sysmutex.c
       ${SDL2_SOURCE_DIR}/src/thread/windows/SDL_syssem.c
       ${SDL2_SOURCE_DIR}/src/thread/windows/SDL_systhread.c
+      ${SDL2_SOURCE_DIR}/src/thread/windows/SDL_systls.c
       ${SDL2_SOURCE_DIR}/src/thread/generic/SDL_syscond.c)
     set(HAVE_SDL_THREADS TRUE)
   endif(SDL_THREADS)