diff --git a/fhem/fhem.pl b/fhem/fhem.pl
index 8437daa54..a8ac45845 100755
--- a/fhem/fhem.pl
+++ b/fhem/fhem.pl
@@ -155,6 +155,7 @@ sub setGlobalAttrBeforeFork($);
 sub setReadingsVal($$$$);
 sub setAttrList($$);
 sub setDevAttrList($;$);
+sub setDisableNotifyFn($$);
 sub setNotifyDev($$);
 sub toJSON($);
 sub utf8ToLatin1($);
@@ -5606,6 +5607,20 @@ notifyRegexpChanged($$;$)
   }
 }
 
+sub
+setDisableNotifyFn($$)
+{
+  my ($hash, $doit) = @_;
+
+  if($doit) {
+    delete($hash->{NOTIFYDEV});
+    $hash->{disableNotifyFn} = 1
+  } else {
+    delete($hash->{disableNotifyFn});
+  }
+  %ntfyHash = ();
+}
+
 sub
 setNotifyDev($$)
 {