diff --git a/debian/rules b/debian/rules
index 33cb065..8310b5e 100755
--- a/debian/rules
+++ b/debian/rules
@@ -33,8 +33,8 @@ config.status: configure
 	export PATH=$(PATH)
 	dh_testdir
 	@if ! mount | grep -qw /proc; then \
-		echo "E: /proc must be mounted" >&2 \
-		exit 1
+		echo "E: /proc must be mounted" >&2; \
+		exit 1; \
 	fi
 	# Add here commands to configure the package.
 	CFLAGS="$(CFLAGS)" PATH_TO_MAILQ="/usr/bin/mailq" ./configure --host=$(DEB_HOST_GNU_TYPE) --build=$(DEB_BUILD_GNU_TYPE) --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --libexecdir=/usr/lib/nagios/plugins --with-nagios-user=nagios --with-nagios-group=nagios --with-trusted-path=/bin:/sbin:/usr/bin:/usr/sbin --with-df-command="/bin/df -Pk" --with-ping-command="/bin/ping -n -U -w %d -c %d %s" --with-ping6-command="/bin/ping6 -n -U -c %d %s"