diff --git a/Makefile b/Makefile
index dffad24..0e8a9e3 100644
--- a/Makefile
+++ b/Makefile
@@ -10,8 +10,7 @@ fetch: subscriptions.curl
 	curl --location --output-dir html --create-dirs --rate 1/s --config subscriptions.curl
 
 channel-json: subscriptions.txt
-	# nproc is not portable :-/
-	xargs -n1 --max-procs=$$(nproc) --arg-file subscriptions.txt --verbose ./generate-json-opml
+	cat subscriptions.txt | xargs -n1 --verbose ./generate-json-opml
 
 # turn all the channel json files into an OPML file
 subscriptions.opml:
diff --git a/generate-json-opml b/generate-json-opml
index fa8893c..27f42db 100755
--- a/generate-json-opml
+++ b/generate-json-opml
@@ -17,4 +17,4 @@ JSON_TITLE=$(json_escape "$TITLE")
 JSON_XML_URL=$(json_escape "$XML_URL")
 JSON_URL=$(json_escape "$URL")
 
-printf '{"title": %s, "xmlUrl": %s, "htmlUrl": %s}\n' "$JSON_TITLE" "$JSON_XML_URL" "$JSON_URL" > json/"$NAME".json
+mkdir -p json && printf '{"title": %s, "xmlUrl": %s, "htmlUrl": %s}\n' "$JSON_TITLE" "$JSON_XML_URL" "$JSON_URL" > json/"$NAME".json