diff --git a/dummy/flrig.c b/dummy/flrig.c
index cae3bdfcc..27d56f32f 100644
--- a/dummy/flrig.c
+++ b/dummy/flrig.c
@@ -1257,6 +1257,10 @@ static int flrig_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width)
         {
             cmd = "rig.set_modeB";
         }
+        else 
+        { // we make VFO_B mode unknown so it expires the cache
+           priv->curr_modeB = RIG_MODE_NONE;
+        }
 
         pxml = xml_build(cmd, cmd_buf, xml, sizeof(xml));
     }
diff --git a/dummy/flrig.h b/dummy/flrig.h
index 673b3988c..8cbf1b71f 100644
--- a/dummy/flrig.h
+++ b/dummy/flrig.h
@@ -28,7 +28,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "1.11"
+#define BACKEND_VER "1.12"
 
 #define EOM "\r"
 #define TRUE 1