diff --git a/plugins/win-capture/graphics-hook/d3d9-capture.cpp b/plugins/win-capture/graphics-hook/d3d9-capture.cpp
index 272e49e2b..effaf5f3a 100644
--- a/plugins/win-capture/graphics-hook/d3d9-capture.cpp
+++ b/plugins/win-capture/graphics-hook/d3d9-capture.cpp
@@ -425,7 +425,7 @@ static bool d3d9_init_format_backbuffer(uint32_t &cx, uint32_t &cy,
 	return true;
 }
 
-static bool d3d9_init_format_swapchain(uint32_t cx, uint32_t cy, HWND window)
+static bool d3d9_init_format_swapchain(uint32_t &cx, uint32_t &cy, HWND &window)
 {
 	D3DPRESENT_PARAMETERS pp;