diff --git a/games/uqm-megamod/uqm-megamod.SlackBuild b/games/uqm-megamod/uqm-megamod.SlackBuild
index 223efaf11e..faf64aa14a 100644
--- a/games/uqm-megamod/uqm-megamod.SlackBuild
+++ b/games/uqm-megamod/uqm-megamod.SlackBuild
@@ -81,7 +81,8 @@ sh build.sh uqm reprocess_config
 # use our flags:
 sed -i "s/-O3/$SLKCFLAGS/g" build.vars
 
-sh build.sh uqm $MAKEFLAGS
+# extract only -jNUM from MAKEFLAGS, any other flags, like -lNUM will break the build.
+sh build.sh uqm $(printf '%s\n' "$MAKEFLAGS" | grep -o -e '-j[0-9]\+' | head -n 1)
 
 mkdir -p $PKG/usr/games
 install -s -m0755 UrQuanMasters $PKG/usr/games/$PRGNAM