diff --git a/cmd/data2json/data2json.go b/cmd/data2json/data2json.go
index e6765cc..10772bd 100644
--- a/cmd/data2json/data2json.go
+++ b/cmd/data2json/data2json.go
@@ -128,7 +128,7 @@ func makeParts(source string) *Parts {
 func makeValues(source, part string) [][5]any {
 	v := make([][5]any, 0)
 
-	filename := fmt.Sprintf("/net/corpora/nlnieuws/data/%d/%s-%s-%d-%02d-%d%s",
+	filename := fmt.Sprintf("/net/corpora/nlnieuws/data/%d/%s-%s-%d.%02d-%d%s",
 		year,
 		sources[source],
 		parts[part].file,