diff --git a/gr-hamnet70/make.sh b/gr-hamnet70/make.sh
index 221b6ab..a20651a 100755
--- a/gr-hamnet70/make.sh
+++ b/gr-hamnet70/make.sh
@@ -6,7 +6,7 @@ mkdir -p build
 cd build
 #cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo ..
 cmake -DCMAKE_BUILD_TYPE=Release ..
-make -j4
+make -j$(ls -d1 /sys/devices/system/cpu/cpu[0-9]* | wc -l)
 
 if [ "$1" == "install" ]; then
 	sudo make install