diff --git a/lib/java/Makefile b/lib/java/Makefile
index cfed416c0954bc5452f90ef32cf111b77b8e4b69..d9c94902d568f1d2c058b2c4daa3518eefebc715 100644
--- a/lib/java/Makefile
+++ b/lib/java/Makefile
@@ -22,7 +22,7 @@ all: labcomm.jar labcomm2014.jar labcomm2006.jar
 
 labcomm.jar: gen/JAVAC
 	echo $@
-	cd gen ; jar cfm ../$@ \
+	cd gen ; jar cf ../$@ \
 		se/lth/control/labcomm/*.class \
 		se/lth/control/labcomm2006/*.class