diff --git a/library/Director/CustomVariable/CustomVariableNumber.php b/library/Director/CustomVariable/CustomVariableNumber.php
new file mode 100644
index 00000000..763db9be
--- /dev/null
+++ b/library/Director/CustomVariable/CustomVariableNumber.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Icinga\Module\Director\CustomVariable;
+
+use Icinga\Exception\ProgrammingError;
+
+class CustomVariableNumber extends CustomVariable
+{
+    public function equals(CustomVariable $var)
+    {
+        return $var->getValue() === $this->getValue();
+    }
+
+    public function getDbFormat()
+    {
+        return 'json';
+    }
+
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    public function setValue($value)
+    {
+        if (! is_int($value) && ! is_float($value)) {
+            throw new ProgrammingError(
+                'Expected a number, got %s',
+                var_export($value, 1)
+            );
+        }
+
+        $this->value = $value;
+
+        return $this;
+    } 
+
+    public function toConfigString()
+    {
+        return (string) $this->value;
+    }
+}