diff --git a/abuild-sign.in b/abuild-sign.in
index 7b5b6db..5890bf5 100644
--- a/abuild-sign.in
+++ b/abuild-sign.in
@@ -17,6 +17,7 @@ fi
 
 do_sign() {
 	local f i keyname repo
+	local openssl=$(command -v openssl || echo libressl)
 
 	# we are actually only interested in the name, not the file itself
 	keyname=${pubkey##*/}
@@ -29,7 +30,7 @@ do_sign() {
 		set -e
 		cd "$repo"
 		sig=".SIGN.RSA.$keyname"
-		openssl dgst -sha1 -sign "$privkey" -out "$sig" "$i"
+		$openssl dgst -sha1 -sign "$privkey" -out "$sig" "$i"
 		tmptargz=$(mktemp)
 		tar -f - -c "$sig" | abuild-tar --cut | gzip -9 > "$tmptargz"
 		tmpsigned=$(mktemp)