diff --git a/haakedriv.c b/haakedriv.c
index d5d8e88..877ffeb 100644
--- a/haakedriv.c
+++ b/haakedriv.c
@@ -254,12 +254,14 @@ static long HaakeRead(long pc, void *object)
     EaseWrite(eab, "F1");
     return __LINE__;
   case __LINE__:                 /**********************************/
+    if (eab->cmd[0] != 'F') goto fsm_quit;
     drv->t = atof(eab->ans) + drv->kelvin;
     if (drv->with2sensors < 1)
       goto nof2;
     EaseWrite(eab, "F2");
     return __LINE__;
   case __LINE__:                 /**********************************/
+    if (eab->cmd[0] != 'F') goto fsm_quit;
     drv->t2 = atof(eab->ans) + drv->kelvin;
     if (drv->t2 < -222) {
       drv->t2 = PAR_NAN;
@@ -268,6 +270,7 @@ static long HaakeRead(long pc, void *object)
     EaseWrite(eab, "S");
     return __LINE__;
   case __LINE__:                 /**********************************/
+    if (eab->cmd[0] != 'S') goto fsm_quit;
     drv->set = atof(eab->ans) + drv->kelvin;
 
   skipGetSet: