diff --git a/src/updpkgsums.sh.in b/src/updpkgsums.sh.in
index 41965f5..e5dbd2b 100644
--- a/src/updpkgsums.sh.in
+++ b/src/updpkgsums.sh.in
@@ -99,6 +99,11 @@ newbuildfile=$(mktemp "${TMPDIR:-/tmp}/updpkgsums.XXXXXX")
 trap "rm -rf '$BUILDDIR' '$newbuildfile'" EXIT
 sumtypes=$(IFS='|'; echo "${known_hash_algos[*]}")
 newsums=$(makepkg -g -p "$buildfile" "${MAKEPKG_OPTS[@]}") || die 'Failed to generate new checksums'
+
+if [[ -z $newsums ]]; then
+	die "$buildfile does not contain sources to update"
+fi
+
 awk -v sumtypes="$sumtypes" -v newsums="$newsums" '
 	$0 ~"^[[:blank:]]*(" sumtypes ")sums(_[^=]+)?=", $0 ~ "\\)[[:blank:]]*(#.*)?$" {
 		if (!w) {