diff --git a/library/Icinga/Web/Session/SessionNamespace.php b/library/Icinga/Web/Session/SessionNamespace.php
index fec3c5dca..02a33dcd4 100644
--- a/library/Icinga/Web/Session/SessionNamespace.php
+++ b/library/Icinga/Web/Session/SessionNamespace.php
@@ -120,7 +120,7 @@ class SessionNamespace implements IteratorAggregate
         $this->values[$key] = $value;
 
         if (in_array($key, $this->removed)) {
-            unset($this->removed[array_search($key, $this->values)]);
+            unset($this->removed[array_search($key, $this->removed)]);
         }
 
         return $this;