diff --git a/Source/DrangPlatform/Source/win32/sync/internal.h b/Source/DrangPlatform/Source/win32/sync/internal.h
new file mode 100644
index 0000000..542b7a2
--- /dev/null
+++ b/Source/DrangPlatform/Source/win32/sync/internal.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <stdbool.h>
+
+struct drang_mutex
+{
+    CRITICAL_SECTION cs;
+    bool initialized;
+};
+
+struct drang_cond
+{
+    CONDITION_VARIABLE cv;
+    bool initialized;
+};
\ No newline at end of file
diff --git a/Source/DrangPlatform/Source/win32/sync/mutex.c b/Source/DrangPlatform/Source/win32/sync/mutex.c
index 80474b6..41b98a3 100644
--- a/Source/DrangPlatform/Source/win32/sync/mutex.c
+++ b/Source/DrangPlatform/Source/win32/sync/mutex.c
@@ -1,16 +1,9 @@
 #include <drang/alloc.h>
 #include <drang/sync.h>
-
-#define WIN32_LEAN_AND_MEAN
-#include <stdbool.h>
-#include <windows.h>
+#include "internal.h"
+
 
 
-struct drang_mutex
-{
-    CRITICAL_SECTION cs;
-    bool initialized;
-};
 
 size_t drang_mutex_size(void)
 {