diff --git a/lib/mk.chroot.sh b/lib/mk.chroot.sh
index 4097523..726df1e 100755
--- a/lib/mk.chroot.sh
+++ b/lib/mk.chroot.sh
@@ -73,7 +73,7 @@ function mkchroot {
 
  if [[ "${I_AM_A_RACECAR}" == "y" ]];
  then
-   RACECAR_CHK='nice -n "-19" '
+   RACECAR_CHK="nice -n \"-19\" "
  else
    RACECAR_CHK=""
  fi