diff --git a/NPLib/scripts/makefile.sh b/NPLib/scripts/makefile.sh
index f6fb86cb4a9ec1c448037197e4657a1bf0d554de..d6183c72bf7a6629b0844a9c9f34af4cbf6ff531 100755
--- a/NPLib/scripts/makefile.sh
+++ b/NPLib/scripts/makefile.sh
@@ -53,6 +53,6 @@ do
       # add "-C ./" pattern at the beginning of the name
       cmd="-C ./$name"
       # execute make command with target specified on command line
-      make --silent $1 $cmd
+      make -j --silent $1 $cmd
    fi ;
 done