diff --git a/language/oop5/interfaces.xml b/language/oop5/interfaces.xml
index f549fad07c..89c45b5fcc 100644
--- a/language/oop5/interfaces.xml
+++ b/language/oop5/interfaces.xml
@@ -54,7 +54,7 @@
   <sect2 xml:id="language.oop5.interfaces.constants">
    <title><literal>Constants</literal></title>
    <para>
-    It's possible for interfaces to have constants. Interface constants works exactly 
+    It's possible for interfaces to have constants. Interface constants work exactly 
     like <link linkend="language.oop5.constants">class constants</link> except
     they cannot be overridden by a class/interface that inherits them.
    </para>