Merged r1175324 to the 1.6 branch.
diff --git a/pom.xml b/pom.xml
index cfbd6c6..77244c9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -145,6 +145,7 @@
                     <artifactId>maven-release-plugin</artifactId>
                     <configuration>
                         <autoVersionSubmodules>true</autoVersionSubmodules>
+                        <preparationGoals>clean install</preparationGoals>
                     </configuration>
                 </plugin>
                 <plugin>