diff --git a/maven-plugin-tools-generators/src/main/java/org/apache/maven/tools/plugin/generator/PluginXdocGenerator.java b/maven-plugin-tools-generators/src/main/java/org/apache/maven/tools/plugin/generator/PluginXdocGenerator.java
index a16725b..99f0a1b 100644
--- a/maven-plugin-tools-generators/src/main/java/org/apache/maven/tools/plugin/generator/PluginXdocGenerator.java
+++ b/maven-plugin-tools-generators/src/main/java/org/apache/maven/tools/plugin/generator/PluginXdocGenerator.java
@@ -527,8 +527,8 @@ public class PluginXdocGenerator
                              w );
             }
 
-            addedUl = addUl( w, addedUl, parameter.getExpression() );
             String expression = parameter.getExpression();
+            addedUl = addUl( w, addedUl, expression );
             String property = getPropertyFromExpression( expression );
             if ( property == null )
             {