diff --git a/miniwin/sdl3gpu/src/miniwin_d3drm.cpp b/miniwin/sdl3gpu/src/miniwin_d3drm.cpp
index 7d1b1b27..adc90f46 100644
--- a/miniwin/sdl3gpu/src/miniwin_d3drm.cpp
+++ b/miniwin/sdl3gpu/src/miniwin_d3drm.cpp
@@ -166,12 +166,14 @@ HRESULT Direct3DRM_SDL3GPUImpl::CreateDevice(IDirect3DRMDevice2** outDevice, DWO
 		NULL
 	);
 	if (device == NULL) {
+		SDL_LogError(LOG_CATEGORY_MINIWIN, "SDL_CreateGPUDevice failed (%s)", SDL_GetError());
 		return DDERR_GENERIC;
 	}
 	if (DDWindow == NULL) {
 		return DDERR_GENERIC;
 	}
 	if (!SDL_ClaimWindowForGPUDevice(device, DDWindow)) {
+		SDL_LogError(LOG_CATEGORY_MINIWIN, "SDL_ClaimWindowForGPUDevice failed (%s)", SDL_GetError());
 		return DDERR_GENERIC;
 	}
 
diff --git a/miniwin/sdl3gpu/src/miniwin_d3drmviewport.cpp b/miniwin/sdl3gpu/src/miniwin_d3drmviewport.cpp
index 1c26ce9a..688da76d 100644
--- a/miniwin/sdl3gpu/src/miniwin_d3drmviewport.cpp
+++ b/miniwin/sdl3gpu/src/miniwin_d3drmviewport.cpp
@@ -30,7 +30,7 @@ Direct3DRMViewport_SDL3GPUImpl::~Direct3DRMViewport_SDL3GPUImpl()
 	FreeDeviceResources();
 }
 
-void D3DRMMatrixMultiply(D3DRMMATRIX4D out, const D3DRMMATRIX4D a, const D3DRMMATRIX4D b)
+static void D3DRMMatrixMultiply(D3DRMMATRIX4D out, const D3DRMMATRIX4D a, const D3DRMMATRIX4D b)
 {
 	for (int i = 0; i < 4; ++i) {
 		for (int j = 0; j < 4; ++j) {