diff --git a/check.sh b/check.sh
index c151a07..849f884 100755
--- a/check.sh
+++ b/check.sh
@@ -1,2 +1,3 @@
 #!/bin/sh
-gpg -o - sha256sums.asc | sha256sum -c --quiet
+sha256sum </dev/null >/dev/null 2>&1 && SHA256=sha256sum || SHA256=gsha256sum
+gpg -o - sha256sums.asc | $SHA256 -c --quiet
diff --git a/release.sh b/release.sh
index 9933bdb..6f2bc87 100755
--- a/release.sh
+++ b/release.sh
@@ -6,6 +6,7 @@ FILES="
   README.md LICENSE
   update.sh check.sh
 "
-sha256sum -t $FILES | gpg --clearsign > sha256sums.asc
+sha256sum </dev/null >/dev/null 2>&1 && SHA256=sha256sum || SHA256=gsha256sum
+$SHA256 -t $FILES | gpg --clearsign > sha256sums.asc
 7z a -tzip -mx=9 asn1js.zip $FILES sha256sums.asc
 rsync -Pvrtz asn1js.zip lapo.it:www/asn1js/