diff --git a/converter/ibmpc_usb/ibmpc_usb.c b/converter/ibmpc_usb/ibmpc_usb.c
index c2b7ea77..b2dc8e85 100644
--- a/converter/ibmpc_usb/ibmpc_usb.c
+++ b/converter/ibmpc_usb/ibmpc_usb.c
@@ -496,9 +496,9 @@ MOUSE_DONE:
 
                         b0 = code;
                         b1 = ibmpc_host_recv_response();
-                        if (b1 == -1) break;
+                        if (b1 == -1) { state = ERROR; break; }
                         b2 = ibmpc_host_recv_response();
-                        if (b2 == -1) break;
+                        if (b2 == -1) { state = ERROR; break; }
 
                         switch (mouse_id) {
                             case MOUSE_DEFAULT:
diff --git a/converter/ibmpc_usb/ibmpc_usb.cpp b/converter/ibmpc_usb/ibmpc_usb.cpp
index cf698763..a17ed342 100644
--- a/converter/ibmpc_usb/ibmpc_usb.cpp
+++ b/converter/ibmpc_usb/ibmpc_usb.cpp
@@ -506,9 +506,9 @@ MOUSE_DONE:
 
                         b0 = code;
                         b1 = ibmpc.host_recv_response();
-                        if (b1 == -1) break;
+                        if (b1 == -1) { state = ERROR; break; }
                         b2 = ibmpc.host_recv_response();
-                        if (b2 == -1) break;
+                        if (b2 == -1) { state = ERROR; break; }
 
                         switch (mouse_id) {
                             case MOUSE_DEFAULT: