diff --git a/include/class_ibutton.php b/include/class_ibutton.php
index c08cb1596..587eab40a 100644
--- a/include/class_ibutton.php
+++ b/include/class_ibutton.php
@@ -33,7 +33,7 @@ class IButton extends HtmlInput
         $this->name=($p_name==null)?$this->name:$p_name;
         $this->value=($p_value==null)?$this->value:$p_value;
 		$this->label=(trim($this->label) != '')?$this->label:$this->value;
-        $class=($p_class="")?" button ":$this->class;
+        $class=($p_class=="")?" button ":$this->class;
         if ( $this->readOnly==true) return $this->display();
         $extra= ( isset($this->extra))?$this->extra:"";
         $this->id=($this->id=="")?$this->name:$this->id;