diff --git a/build.xml b/build.xml
index 7a3e0b0..e4111be 100644
--- a/build.xml
+++ b/build.xml
@@ -24,10 +24,10 @@
   </target>
 
   <target name="snowpack" depends="snowpack.check,yarn" if="snowpack.run">
+    <!-- Build for development -->
     <exec executable="yarn" dir="${web-dir}">
       <arg value="run"/>
       <arg value="snowpack"/>
-      <arg value="--optimize"/>
     </exec>
   </target>
 
@@ -39,6 +39,23 @@
     </condition>
   </target>
 
+  <target name="snowpack-build" depends="snowpack-build.check,yarn" if="snowpack-build.run">
+    <!-- Build for distribution -->
+    <exec executable="yarn" dir="${web-dir}">
+      <arg value="run"/>
+      <arg value="snowpack"/>
+      <arg value="build"/>
+    </exec>
+  </target>
+
+  <target name="snowpack-build.check">
+    <condition property="snowpack-build.run">
+      <not>
+        <available file="${web-dir}/build/web_modules"/>
+      </not>
+    </condition>
+  </target>
+
   <target name="parcel" depends="parcel.check,yarn" if="parcel.run">
     <exec executable="yarn" dir="${web-dir}">
       <arg value="parcel"/>
@@ -78,7 +95,7 @@
     </exec>
   </target>
 
-  <target name="web.resources" depends="snowpack" unless="skip-web"/>
+  <target name="web.resources" depends="snowpack,snowpack-build" unless="skip-web"/>
   <target name="web.check" unless="skip-web" depends="web.resources,flow,eslint"/>
   <target name="web.bundle" unless="skip-web" depends="web.resources,parcel"/>
   <target name="web" unless="skip-web" depends="web.resources,web.check,web.bundle" description="Generate web resources"/>