diff --git a/Mk/Scripts/makesum.sh b/Mk/Scripts/makesum.sh
index 1d09b7ffb82a..c9f50e56bb5d 100644
--- a/Mk/Scripts/makesum.sh
+++ b/Mk/Scripts/makesum.sh
@@ -1,53 +1,53 @@
 #!/bin/sh
 #
 # MAINTAINER: portmgr@FreeBSD.org
 
 set -e
 set -o pipefail
 
 . "${dp_SCRIPTSDIR}/functions.sh"
 
 validate_env dp_CHECKSUM_ALGORITHMS dp_CKSUMFILES dp_DISTDIR dp_DISTINFO_FILE \
 	dp_ECHO_MSG
 
 [ -n "${DEBUG_MK_SCRIPTS}" -o -n "${DEBUG_MK_SCRIPTS_MAKESUM}" ] && set -x
 
 set -u
 
 DISTINFO_OLD=$(mktemp -t makesum-old)
 DISTINFO_NEW=$(mktemp -t makesum-new)
 
 trap 'rm -f ${DISTINFO_OLD} ${DISTINFO_NEW}' EXIT INT TERM
 
 check_checksum_algorithms
 
 cd "${dp_DISTDIR}"
 
 # Running `make makesum` a twice should not change the timestamp generated from
 # the first run.
 # So, we extract the content of the distinfo file minus the TIMESTAMP, if it
 # contains a TIMESTAMP.
 if [ -f "${dp_DISTINFO_FILE}" ] && grep -q "^TIMESTAMP " ${dp_DISTINFO_FILE}; then
-	grep -v "^TIMESTAMP " ${dp_DISTINFO_FILE} > ${DISTINFO_OLD}
+	grep -v "^TIMESTAMP " ${dp_DISTINFO_FILE} > ${DISTINFO_OLD} || true
 fi
 
 for file in ${dp_CKSUMFILES}; do
 	for alg in ${dp_CHECKSUM_ALGORITHMS}; do
 		eval "alg_executable=\$dp_$alg"
 
 		if [ "$alg_executable" != "NO" ]; then
 			$alg_executable "$file" >> "${DISTINFO_NEW}"
 		fi
 	done
 	echo "SIZE ($file) = $(stat -f %z "$file")" >> "${DISTINFO_NEW}"
 done
 
 # Now, we generate the distinfo file in two cases:
 # - If the saved file is empty, it means there was no TIMESTAMP in it, so we
 #   need to add one.
 # - If the old and new distinfo content minus the TIMESTAMP differ, it means
 #   something was updated or changed, it is time to generate a new timestamp.
 if [ ! -s ${DISTINFO_OLD} ] || ! cmp -s ${DISTINFO_OLD} ${DISTINFO_NEW}; then
 	echo "TIMESTAMP = $(date '+%s')" > ${dp_DISTINFO_FILE}
 	cat ${DISTINFO_NEW} >> ${dp_DISTINFO_FILE}
 fi