diff --git a/pom.xml b/pom.xml
index 94fe9e9..1140e8c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -32,6 +32,11 @@
 executing.</description>
 
 	<properties>
+		<!-- Old-style .class files for compatibility with Spring 3
+		     https://stackoverflow.com/a/22527057
+                -->
+		<maven.compiler.source>1.7</maven.compiler.source>
+		<maven.compiler.target>1.7</maven.compiler.target>
 		<!-- Set these to control what is used for signing code. -->
 		<signing.keystore>${project.parent.basedir}/src/main/signing/signing.jks</signing.keystore>
 		<signing.user>taverna</signing.user>