diff --git a/src/filters/transform/vsfilter/csriapi.cpp b/src/filters/transform/vsfilter/csriapi.cpp
index f4536459..0436a28c 100644
--- a/src/filters/transform/vsfilter/csriapi.cpp
+++ b/src/filters/transform/vsfilter/csriapi.cpp
@@ -114,6 +114,7 @@ CSRIAPI int csri_request_fmt(csri_inst *inst, const struct csri_fmt *fmt)
 	// Check if pixel format is supported
 	switch (fmt->pixfmt) {
 		case CSRI_F_BGR_:
+		case CSRI_F_BGRA:
 			inst->pixfmt = fmt->pixfmt;
 			break;
 
@@ -136,7 +137,10 @@ CSRIAPI void csri_render(csri_inst *inst, struct csri_frame *frame, double time)
 	spd.w = inst->screen_res.cx;
 	spd.h = inst->screen_res.cy;
 	switch (inst->pixfmt) {
+		// xy-VSFilter treats BGR_ as having an alpha channel since 2014,
+		// specifically commit 6a6f7cb39a446aa761abe40ffc94d659fe4a4c3f
 		case CSRI_F_BGR_:
+		case CSRI_F_BGRA:
 			spd.type = MSP_RGBA;
 			spd.bpp = 32;
 			spd.bits = frame->planes[0];
@@ -146,7 +150,7 @@ CSRIAPI void csri_render(csri_inst *inst, struct csri_frame *frame, double time)
 		default:
 			ASSERT(0);
 			CString msg;
-			msg.Format(_T("Anything other then RGB32 is NOT supported!"));
+			msg.Format(_T("Anything other than BGR(A)32 is NOT supported!"));
 			MessageBox(NULL, msg, _T("Warning"), MB_OKCANCEL|MB_ICONWARNING);
 			return;
 	}