diff --git a/.externalToolBuilders/Ant_Builder.launch b/.externalToolBuilders/Ant_Builder.launch
index a535c81..ab963b9 100644
--- a/.externalToolBuilders/Ant_Builder.launch
+++ b/.externalToolBuilders/Ant_Builder.launch
@@ -13,6 +13,7 @@
 <stringAttribute key="org.eclipse.jdt.launching.CLASSPATH_PROVIDER" value="org.eclipse.ant.ui.AntClasspathProvider"/>
 <booleanAttribute key="org.eclipse.jdt.launching.DEFAULT_CLASSPATH" value="true"/>
 <stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="LispInterpreter"/>
+<booleanAttribute key="org.eclipse.ui.externaltools.ATTR_BUILDER_ENABLED" value="true"/>
 <stringAttribute key="org.eclipse.ui.externaltools.ATTR_LOCATION" value="${workspace_loc:/LispInterpreter/build.xml}"/>
 <stringAttribute key="org.eclipse.ui.externaltools.ATTR_RUN_BUILD_KINDS" value="full,incremental,auto,clean"/>
 <booleanAttribute key="org.eclipse.ui.externaltools.ATTR_TRIGGERS_CONFIGURED" value="true"/>
diff --git a/build.xml b/build.xml
index 83bc670..d8d1819 100644
--- a/build.xml
+++ b/build.xml
@@ -18,7 +18,7 @@
 
     <target name="compile">
         <javac srcdir="${src.dir}"
-               destdir="${build.dir}"
+               destdir="${classes.dir}"
                includeantruntime="false" />
     </target>