diff --git a/briar-api/build.xml b/briar-api/build.xml
index 07cb99d74803146405c068d3cadc88cc5acf5387..d5d06930235c808ad13a1ffaa04a22c6936f0d5c 100644
--- a/briar-api/build.xml
+++ b/briar-api/build.xml
@@ -10,7 +10,7 @@
 	</target>
 	<target name='compile'>
 		<mkdir dir='build'/>
-		<javac srcdir='src' destdir='build' source='1.5'
+		<javac srcdir='src' destdir='build' source='1.5' target='1.5'
 			includeantruntime='false' debug='off'>
 			<classpath>
 				<fileset refid='api-jars'/>
diff --git a/briar-core/build.xml b/briar-core/build.xml
index f2511c69e4e9dc47b4daa97e1b5596d13940c0d0..e6cd586796638bd1d757768dff9e7008f99ed393 100644
--- a/briar-core/build.xml
+++ b/briar-core/build.xml
@@ -15,14 +15,14 @@
 	<target name='compile'>
 		<mkdir dir='../briar-api/build'/>
 		<javac srcdir='../briar-api/src'
-			destdir='../briar-api/build' source='1.5'
+			destdir='../briar-api/build' source='1.5' target='1.5'
 			includeantruntime='false' debug='off'>
 			<classpath>
 				<fileset refid='api-jars'/>
 			</classpath>
 		</javac>
 		<mkdir dir='build'/>
-		<javac srcdir='src' destdir='build' source='1.5'
+		<javac srcdir='src' destdir='build' source='1.5' target='1.5'
 			includeantruntime='false' debug='off'>
 			<classpath>
 				<fileset refid='core-jars'/>
diff --git a/briar-tests/build.xml b/briar-tests/build.xml
index 655e6f80edbd4e7c6b3a48b5d6e4955ef31c3c64..d634e63442c102bd80d55f77e835cb8d8fc7f555 100644
--- a/briar-tests/build.xml
+++ b/briar-tests/build.xml
@@ -26,7 +26,7 @@
 	<target name='compile'>
 		<mkdir dir='../briar-api/build'/>
 		<javac srcdir='../briar-api/src'
-			destdir='../briar-api/build' source='1.5'
+			destdir='../briar-api/build' source='1.5' target='1.5'
 			includeantruntime='false' debug='off'>
 			<classpath>
 				<fileset refid='api-jars'/>
@@ -34,7 +34,7 @@
 		</javac>
 		<mkdir dir='../briar-core/build'/>
 		<javac srcdir='../briar-core/src'
-			destdir='../briar-core/build' source='1.5'
+			destdir='../briar-core/build' source='1.5' target='1.5'
 			includeantruntime='false' debug='off'>
 			<classpath>
 				<fileset refid='core-jars'/>
@@ -43,7 +43,7 @@
 			</classpath>
 		</javac>
 		<mkdir dir='build'/>
-		<javac srcdir='src' destdir='build' source='1.5'
+		<javac srcdir='src' destdir='build' source='1.5' target='1.5'
 			includeantruntime='false' debug='off'>
 			<classpath>
 				<fileset refid='test-jars'/>