diff --git a/Makefile b/Makefile
index 076e29a..429717e 100644
--- a/Makefile
+++ b/Makefile
@@ -31,7 +31,7 @@ clean:
 	rm -f result.jar
 
 pack result.jar: $(CLS)
-	jar -cmf META-INF/MANIFEST.MF result.jar -C build . -C res .
+	$(JAVA_HOME)/bin/jar -cmf META-INF/MANIFEST.MF result.jar -C build . -C res .
 
 run:
 	$(EMULATOR) result.jar