diff --git a/pom.xml b/pom.xml
index 810668c..4d6987d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -39,6 +39,13 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>1.4</source>
+          <target>1.4</target>
+        </configuration>
+      </plugin>
     </plugins>
   </build>