diff --git a/tools/xvfb-init.sh b/tools/xvfb-init.sh
index 7e2890d8a5b0..47151fd2c213 100644
--- a/tools/xvfb-init.sh
+++ b/tools/xvfb-init.sh
@@ -1,6 +1,6 @@
 XVFB=/usr/bin/Xvfb
 XVFBARGS="$DISPLAY -ac -screen 0 1024x768x16 +extension RANDR"
-PIDFILE=/var/xvfb_${DISPLAY:1}.pid
+PIDFILE=/var/xvfb_$DISPLAY.pid
 case "$1" in
   start)
     echo -n "Starting virtual X frame buffer: Xvfb"