diff --git a/diylc/diylc-core/build.xml b/diylc/diylc-core/build.xml
index e81ef3b5..5d0cdc81 100644
--- a/diylc/diylc-core/build.xml
+++ b/diylc/diylc-core/build.xml
@@ -17,7 +17,7 @@
 	<target name="compile">
 		<mkdir dir="${classes.dir}" />
 		<echo>Compile with JDK ${java.runtime.version}</echo>
-		<javac encoding="8859_1" srcdir="${src.dir}" destdir="${classes.dir}" classpathref="class.path" />
+		<javac encoding="8859_1" srcdir="${src.dir}" destdir="${classes.dir}" classpathref="class.path" includeantruntime="false" />
 	</target>
 
 	<target name="resource.copy">
diff --git a/diylc/diylc-library/build.xml b/diylc/diylc-library/build.xml
index 849f5ee8..16b59a79 100644
--- a/diylc/diylc-library/build.xml
+++ b/diylc/diylc-library/build.xml
@@ -17,7 +17,7 @@
 		<ant antfile="../diylc-core/build.xml" target="jar" inheritAll="false"/>
 		<mkdir dir="${classes.dir}" />
 		<echo>Compile with JDK ${java.runtime.version}</echo>
-		<javac encoding="8859_1" srcdir="${basedir}/${src.dir}" destdir="${classes.dir}" classpathref="class.path" debug="true" />
+		<javac encoding="8859_1" srcdir="${basedir}/${src.dir}" destdir="${classes.dir}" classpathref="class.path" debug="true" includeantruntime="false" />
 	</target>
 
 	<target name="resource.copy">
diff --git a/diylc/diylc-swing/build.xml b/diylc/diylc-swing/build.xml
index 54697c23..55c20572 100644
--- a/diylc/diylc-swing/build.xml
+++ b/diylc/diylc-swing/build.xml
@@ -24,7 +24,7 @@
 		<ant antfile="../diylc-library/build.xml" target="jar" inheritAll="false" />
 		<mkdir dir="${classes.dir}" />
 		<echo>Compile with JDK ${java.runtime.version}</echo>
-		<javac compiler="modern" encoding="8859_1" srcdir="${src.dir}" destdir="${classes.dir}" classpathref="class.path">
+		<javac compiler="modern" encoding="8859_1" srcdir="${src.dir}" destdir="${classes.dir}" classpathref="class.path" includeantruntime="false">
 			<compilerarg value="-proc:none" />
 		</javac>
 	</target>