diff --git a/network/heimdal/heimdal.SlackBuild b/network/heimdal/heimdal.SlackBuild
index ac41b84986..6ea71738e8 100644
--- a/network/heimdal/heimdal.SlackBuild
+++ b/network/heimdal/heimdal.SlackBuild
@@ -80,9 +80,9 @@ CXXFLAGS="$SLKCFLAGS" \
   --disable-otp \
   --disable-static
 
-make
-make check
-make install-strip DESTDIR=$PKG
+make -j1
+make -j1 check
+make -j1 install-strip DESTDIR=$PKG
 
 rm -rf $PKG/usr/heimdal/man/cat?
 find $PKG/usr/heimdal/man -type f -exec gzip -9 {} \;