diff --git a/src/d3d9/d3d9_mem.h b/src/d3d9/d3d9_mem.h
index f2ffde0a..20ac138c 100644
--- a/src/d3d9/d3d9_mem.h
+++ b/src/d3d9/d3d9_mem.h
@@ -12,6 +12,8 @@
   #include <winbase.h>
 #endif
 
+#include <vector>
+
 namespace dxvk {
 
   class D3D9MemoryAllocator;