diff --git a/.gitignore b/.gitignore
index 2dc040f..87fa8d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@ build/
 *.code-workspace
 .fridge/
 .oven/
+/.vs
diff --git a/include/thread_api.h b/include/thread_api.h
index 455fbd1..e50074a 100644
--- a/include/thread_api.h
+++ b/include/thread_api.h
@@ -71,6 +71,7 @@ typedef HANDLE thrd_t;
 #define thrd_error   -1
 
 #define mtx_plain NULL
+#define mtx_recursive NULL
 
 static inline int mtx_init(mtx_t* mtx, void* unused) {
     InitializeCriticalSection(mtx);