diff --git a/output/dll/bizswan.dll b/output/dll/bizswan.dll
index dcbd9d7842..a2850a7d9d 100644
Binary files a/output/dll/bizswan.dll and b/output/dll/bizswan.dll differ
diff --git a/wonderswan/system.cpp b/wonderswan/system.cpp
index c88e99c51c..f22ee553af 100644
--- a/wonderswan/system.cpp
+++ b/wonderswan/system.cpp
@@ -85,6 +85,7 @@ namespace MDFN_IEN_WSWAN
 		oldbuttons = buttons;
 
 		memory.WSButtonStatus = rotate ? RotateButtons(buttons) : buttons;
+		memory.WSButtonStatus &= 0x3ff; // mask out "rotate" bit and other unused bits
 		memory.Lagged = true;
 		while (!gfx.ExecuteLine(surface, novideo))
 		{