diff --git a/libraries/gdal/gdal.SlackBuild b/libraries/gdal/gdal.SlackBuild
index eeabac69ac..4d7a9d7fac 100644
--- a/libraries/gdal/gdal.SlackBuild
+++ b/libraries/gdal/gdal.SlackBuild
@@ -138,7 +138,7 @@ CXXFLAGS="$SLKCFLAGS" \
   $WITHLIST \
   --build=$ARCH-slackware-linux
 
-make
+make -j1
 make install DESTDIR=$PKG
 
 # Kill erroneously installed .dox files