diff --git a/run/run.sh b/run/run.sh
index 2e0dd99..9c4ab7f 100755
--- a/run/run.sh
+++ b/run/run.sh
@@ -3,11 +3,11 @@ set -eu
 
 # Docker environment variabeles
 
-: ${BOOT:=''}                   # URL of the ISO file
-: ${DEBUG:='N'}             # Enable debug mode
-: ${ALLOCATE:='Y'}       # Preallocate diskspace
-: ${CPU_CORES:='1'}     # Amount of CPU cores
-: ${DISK_SIZE:='16G'}    # Initial data disk size
+: ${BOOT:=''}         # URL of the ISO file
+: ${DEBUG:='N'}       # Enable debug mode
+: ${ALLOCATE:='Y'}    # Preallocate diskspace
+: ${CPU_CORES:='1'}   # Amount of CPU cores
+: ${DISK_SIZE:='16G'} # Initial data disk size
 : ${RAM_SIZE:='512M'} # Maximum RAM amount
 
 echo "Starting QEMU for Docker v${VERSION}..."
@@ -68,5 +68,5 @@ set +m
 if (( KERNEL > 4 )); then
   pidwait -F "${_QEMU_PID}" & wait $!
 else
-  tail --pid "$(cat ${_QEMU_PID})" --follow /dev/null & wait $!
+  tail --pid "$(cat "${_QEMU_PID}")" --follow /dev/null & wait $!
 fi