diff --git a/buildscript b/buildscript
index 9b194e7e..af929d71 100755
--- a/buildscript
+++ b/buildscript
@@ -208,13 +208,19 @@ build() {
 
     case "$1" in
         "debug")
-            make V=99
+            if [ -n "$2" ]; then
+                make V=99 -j $2
+            else
+                make V=99
+            fi
             ;;
         "fast")
-            ionice -c 2 -- nice -n 1 -- make -j $((cpus*2))
+            [ -n "$2" ] && threads=$2 || threads=$((cpus*2))
+            ionice -c 2 -- nice -n 1 -- make -j $threads
             ;;
         *)
-            ionice -c 3 -- nice -n 10 -- make -j $((cpus+1))
+            [ -n "$2" ] && threads=$2 || threads=$((cpus+1))
+            ionice -c 3 -- nice -n 10 -- make -j $threads
             ;;
     esac
 
@@ -444,13 +450,13 @@ case "$1" in
     "build")
         if [ "$2" = "help" ] || [ "$2" = "x" ]; then
             echo "This option compiles the firmware"
-            echo "Normaly the build uses lower IO and System priorities, "
+            echo "Normally the build uses lower IO and System priorities, "
             echo "you can append \"fast\" option, to use normal user priorities"
             echo
-            echo "Usage: $0 $1 [fast|debug]"
+            echo "Usage: $0 $1 [fast|debug] [numthreads]"
             echo
         else
-            build "$2"
+            build "$2" "$3"
         fi
         ;;
     "config")