diff --git a/build/windows/launcher/config.xml b/build/windows/launcher/config.xml
index dbce4974b..3f427d040 100644
--- a/build/windows/launcher/config.xml
+++ b/build/windows/launcher/config.xml
@@ -15,6 +15,7 @@
   <icon>application.ico</icon>
   <classPath>
     <mainClass>processing.app.Base</mainClass>
+    <cp>lib/arduino-core.jar</cp>
     <cp>lib/pde.jar</cp>
     <cp>lib/jna.jar</cp>
     <cp>lib/ecj.jar</cp>
diff --git a/build/windows/launcher/config_debug.xml b/build/windows/launcher/config_debug.xml
index 2d1daea26..8af63a463 100644
--- a/build/windows/launcher/config_debug.xml
+++ b/build/windows/launcher/config_debug.xml
@@ -15,6 +15,7 @@
   <icon>application.ico</icon>
   <classPath>
     <mainClass>processing.app.Base</mainClass>
+    <cp>lib/arduino-core.jar</cp>
     <cp>lib/pde.jar</cp>
     <cp>lib/jna.jar</cp>
     <cp>lib/ecj.jar</cp>