diff --git a/includes/rules.core.inc b/includes/rules.core.inc
index 831de0f..38338b1 100644
--- a/includes/rules.core.inc
+++ b/includes/rules.core.inc
@@ -1349,7 +1349,7 @@ abstract class RulesAbstractPlugin extends RulesPlugin {
     // Make sure the element is known.
     $this->forceSetUp();
     if (!isset($this->cache[$this->itemName . '_info'][$this->elementName])) {
-      throw new RulesIntegrityException(t('Unkown @plugin %name.', array('@plugin' => $this->plugin(), '%name' => $this->elementName)));
+      throw new RulesIntegrityException(t('Unknown @plugin %name.', array('@plugin' => $this->plugin(), '%name' => $this->elementName)));
     }
     $this->validate();
     return $this;
diff --git a/ui/ui.controller.inc b/ui/ui.controller.inc
index e89c020..80aecfa 100644
--- a/ui/ui.controller.inc
+++ b/ui/ui.controller.inc
@@ -255,7 +255,7 @@ class RulesUIController {
       $events = array();
       if ($config instanceof RulesTriggerableInterface) {
         foreach ($config->events() as $event_name) {
-          $this->event_info += array($event_name => array('label' => t('Unkown event "!event_name"', array('!event_name' => $event_name))));
+          $this->event_info += array($event_name => array('label' => t('Unknown event "!event_name"', array('!event_name' => $event_name))));
           $events[] = check_plain($this->event_info[$event_name]['label']);
         }
       }
diff --git a/ui/ui.plugins.inc b/ui/ui.plugins.inc
index d4b5de7..eb6fd45 100755
--- a/ui/ui.plugins.inc
+++ b/ui/ui.plugins.inc
@@ -100,7 +100,7 @@ class RulesReactionRuleUI extends RulesRuleUI {
     );
     $form['events']['table']['#attributes']['class'][] = 'rules-elements-table';
     foreach ($this->rule->events() as $event_name) {
-      $event_info += array($event_name => array('label' => t('Unkown event "!event_name"', array('!event_name' => $event_name))));
+      $event_info += array($event_name => array('label' => t('Unknown event "!event_name"', array('!event_name' => $event_name))));
       $form['events']['table']['#rows'][$event_name] = array(
         check_plain($event_info[$event_name]['label']),
         '<span class="rules_rule_event">' . l(t('delete'), RulesPluginUI::path($this->rule->name, 'delete/event/' . $event_name)) . '</span>',