cvs-dist: missing quotes in sed command

Makefile.am

diff --git a/Makefile.am b/Makefile.am
index 32cb1d3..81982a3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -82,7 +82,7 @@
 # Tag before making distribution.  Also, don't make a distribution if
 # checks fail.  Also, make sure the NEWS file is up-to-date.
 cvs-dist: distcheck
-	@if sed 1,2d;3q $(srcdir)/NEWS | grep -e "$(VERSION)" > /dev/null; then :; else \
+	@if sed '1,2d;3q' $(srcdir)/NEWS | grep -e "$(VERSION)" > /dev/null; then :; else \
 	  echo "NEWS not updated; not releasing" 1>&2; \
 	  exit 1;				\
 	fi