diff --git a/scripts/filesize.sh b/scripts/filesize.sh
new file mode 100755
index 00000000..1a6ea4dd
--- /dev/null
+++ b/scripts/filesize.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+check_command() {
+	which "$1" >/dev/null 2>&1
+}
+
+if check_command gnustat; then
+	gnustat -c%s "$@"
+elif check_command gstat; then
+	gstat -c%s "$@"
+elif check_command stat; then
+	stat -c%s "$@"
+else
+	echo "$0: no suitable stat implementation was found" >&2
+	exit 1
+fi
diff --git a/scripts/generate_manifest.sh b/scripts/generate_manifest.sh
index a9dfca3c..d0f1ce4e 100755
--- a/scripts/generate_manifest.sh
+++ b/scripts/generate_manifest.sh
@@ -21,8 +21,22 @@ generate_line() {
 	local model="$1"
 	local file="$2"
 
-	[ ! -e "${GLUON_IMAGEDIR}/sysupgrade/$file" ] || echo "$model" "$GLUON_RELEASE" "$(scripts/sha256sum.sh "${GLUON_IMAGEDIR}/sysupgrade/$file")" "$file"
-	[ ! -e "${GLUON_IMAGEDIR}/sysupgrade/$file" ] || echo "$model" "$GLUON_RELEASE" "$(scripts/sha512sum.sh "${GLUON_IMAGEDIR}/sysupgrade/$file")" "$file"
+	[ ! -e "${GLUON_IMAGEDIR}/sysupgrade/$file" ] || echo \
+		"$model" \
+		"$GLUON_RELEASE" \
+		"$(scripts/sha256sum.sh "${GLUON_IMAGEDIR}/sysupgrade/$file")" \
+		"$(scripts/filesize.sh "${GLUON_IMAGEDIR}/sysupgrade/$file")" \
+		"$file"
+	[ ! -e "${GLUON_IMAGEDIR}/sysupgrade/$file" ] || echo \
+		"$model" \
+		"$GLUON_RELEASE" \
+		"$(scripts/sha256sum.sh "${GLUON_IMAGEDIR}/sysupgrade/$file")" \
+		"$file"
+	[ ! -e "${GLUON_IMAGEDIR}/sysupgrade/$file" ] || echo \
+		"$model" \
+		"$GLUON_RELEASE" \
+		"$(scripts/sha512sum.sh "${GLUON_IMAGEDIR}/sysupgrade/$file")" \
+		"$file"
 }
 
 generate() {