diff --git a/build.sh b/build.sh
index 4cb51f5..b88dae3 100755
--- a/build.sh
+++ b/build.sh
@@ -52,9 +52,18 @@ I2P_JBIGI="$HERE/../i2p.i2p.jpackage-build/installer/lib/jbigi"
 echo "compiling custom launcher"
 mkdir build
 cp "$I2P_JARS"/*.jar build
+if [ ! -f "$HERE/build/jna.jar" ]; then
+  wget -O "$HERE/build/jna.jar" https://repo1.maven.org/maven2/net/java/dev/jna/jna/$JNA_VERSION/jna-$JNA_VERSION.jar
+fi
+
 
 cd java
-"$JAVA_HOME"/bin/javac -d ../build -classpath "$HERE"/build/i2p.jar:"$HERE"/build/router.jar:"$HERE"/build/routerconsole.jar net/i2p/router/WinLauncher.java net/i2p/router/WindowsUpdatePostProcessor.java net/i2p/router/WinUpdateProcess.java
+"$JAVA_HOME"/bin/javac -d ../build -classpath "$HERE/build/jna.jar":"$HERE/build/i2p.jar":"$HERE/build/router.jar":"$HERE/build/routerconsole.jar" \
+  net/i2p/router/Shell32X.java \
+  net/i2p/router/WinLauncher.java \
+  net/i2p/router/WindowsUpdatePostProcessor.java \
+  net/i2p/router/WinUpdateProcess.java
+
 cd ..
 
 #echo "building launcher.jar"
diff --git a/i2pversion b/i2pversion
index 1f616b6..9838730 100644
--- a/i2pversion
+++ b/i2pversion
@@ -1,5 +1,7 @@
 #! /usr/bin/env sh
 
+JNA_VERSION=5.10.0
+export JNA_VERSION=5.10.0
 
 #Comment this out to build from an alternate branch or
 # the tip of the master branch.