diff --git a/sysdump.sh b/sysdump.sh
index 0ebe760..230c371 100755
--- a/sysdump.sh
+++ b/sysdump.sh
@@ -60,6 +60,7 @@ dumpdisk() {
 	[ -z "$2" ] && return
 	entry=$1
 	shift
+	command -v "tar" >/dev/null 2>&1 || { echo "Cannot dump \"$1\" (tar not found)" >> "${LOG_FILE}"; return; }
 	value=$(tar cf - "$1" 2>/dev/null|base64 -w 0)
 	[ "$USE_COMMA" -eq 1 ] && echo "\"${entry}\": \"${value}\","
 	[ "$USE_COMMA" -eq 0 ] && echo "\"${entry}\": \"${value}\""