diff --git a/reference/gmagick/gmagick/minifyimage.xml b/reference/gmagick/gmagick/minifyimage.xml
index 1eed266baa..f09bbe0f33 100644
--- a/reference/gmagick/gmagick/minifyimage.xml
+++ b/reference/gmagick/gmagick/minifyimage.xml
@@ -10,7 +10,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <modifier>public</modifier> <type>void</type><methodname>Gmagick::minifyimage</methodname>
+   <modifier>public</modifier> <type>Gmagick</type><methodname>Gmagick::minifyimage</methodname>
    <void />
   </methodsynopsis>
   <para>