units: fix variable expansion

diff --git a/units/rescue.service.m4 b/units/rescue.service.m4
index d173bebabce134ee36183b9b1b70fe6dfa08244d..d31282d37e972be50158b404232cf1cd6629d8d5 100644 (file)
--- a/units/rescue.service.m4
+++ b/units/rescue.service.m4
@@ -22,7 +22,7 @@ ExecStartPre=-/bin/plymouth --hide-splash
 ExecStartPre=-/bin/echo 'Welcome to rescue mode. Use "systemctl default" or ^D to activate default mode.'
 m4_ifdef(`TARGET_FEDORA',
 `EnvironmentFile=/etc/sysconfig/init
-ExecStart=-/bin/bash -c "exec $SINGLE"',
+ExecStart=-/bin/bash -c "exec ${SINGLE}"',
 `ExecStart=-/sbin/sulogin')
 ExecStopPost=/bin/systemctl default
 StandardInput=tty-force