diff --git a/academic/Gridcoin-Research/Gridcoin-Research.SlackBuild b/academic/Gridcoin-Research/Gridcoin-Research.SlackBuild
index b311b81328..c6121cf35b 100644
--- a/academic/Gridcoin-Research/Gridcoin-Research.SlackBuild
+++ b/academic/Gridcoin-Research/Gridcoin-Research.SlackBuild
@@ -29,7 +29,6 @@ VERSION=${VERSION:-5.3.2.0}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 PKGTYPE=${PKGTYPE:-tgz}
-NUMJOBS=${NUMJOBS:-1}
 
 if [ -z "$ARCH" ]; then
   case "$( uname -m )" in
@@ -108,7 +107,7 @@ CXXFLAGS="$SLKCFLAGS" \
   $usepnp \
   --build=$ARCH-slackware-linux
 
-make -j${NUMJOBS}
+make
 make install DESTDIR=$PKG
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \