diff --git a/fhem/FHEM/98_dummy.pm b/fhem/FHEM/98_dummy.pm
index c2651175b..5494f16ee 100644
--- a/fhem/FHEM/98_dummy.pm
+++ b/fhem/FHEM/98_dummy.pm
@@ -14,6 +14,7 @@ dummy_Initialize($)
   $hash->{SetFn}     = "dummy_Set";
   $hash->{DefFn}     = "dummy_Define";
   $hash->{AttrList}  = "readingList setList useSetExtensions " .
+                       "disable disabledForIntervals ".
                        $readingFnAttributes;
 }
 
@@ -37,6 +38,11 @@ dummy_Set($@)
     return "Unknown argument ?, choose one of $setList" if($a[0] eq "?");
   }
 
+  return undef
+    if($attr{$name} &&  # Avoid checking it if only STATE is inactive
+       ($attr{$name}{disable} || $attr{$name}{disabledForIntervals}) &&
+       IsDisabled($name));
+
   my @rl = split(" ", AttrVal($name, "readingList", ""));
   my $doRet;
   eval {
@@ -110,6 +116,8 @@ dummy_Define($$)
   <a name="dummyattr"></a>
   <b>Attributes</b>
   <ul>
+    <li><a href="#disable">disable</a></li>
+    <li><a href="#disabledForIntervals">disabledForIntervals</a></li>
     <li><a name="readingList">readingList</a><br>
       Space separated list of readings, which will be set, if the first
       argument of the set command matches one of them.</li>
@@ -171,6 +179,8 @@ dummy_Define($$)
   <a name="dummyattr"></a>
   <b>Attributes</b>
   <ul>
+    <li><a href="#disable">disable</a></li>
+    <li><a href="#disabledForIntervals">disabledForIntervals</a></li>
     <li><a name="readingList">readingList</a><br>
       Leerzeichen getrennte Liste mit Readings, die mit "set" gesetzt werden
       k&ouml;nnen.</li>
diff --git a/fhem/fhem.pl b/fhem/fhem.pl
index b0e146dc9..f2c0b48d6 100755
--- a/fhem/fhem.pl
+++ b/fhem/fhem.pl
@@ -1590,7 +1590,7 @@ ReplaceSetMagic($$@)       # Forum #38276
 
   $a =~ s/\[([a-z0-9._]+):([a-z0-9._-]+)(:d)?\]/{
     my $x = $3 ? ReadingsNum($1,$2,"") : ReadingsVal($1,$2,"");
-    $x eq "" ? "[$1:$2$3]" : $x
+    $x eq "" ? "[$1:$2".($3?$3:"")."]" : $x
   }/egi;
 
   $evalSpecials->{'%DEV'} = $hash->{NAME};