diff --git a/rebuild b/rebuild
index 940d381..5d2b1df 100755
--- a/rebuild
+++ b/rebuild
@@ -1,7 +1,12 @@
 #!/usr/bin/env bash
+processor_count=`grep -c "^processor" /proc/cpuinfo`
+count=$((${processor_count} - 1))
+echo "Detected ${processor_count} processors, using ${count}"
+
 make distclean
 pushd ..
 ./autogen.sh
 popd
+
 ../configure --prefix=/opt/local --enable-ipv6 CXXFLAGS="-O0 -g"
-make -kj11
+make -kj${count}