diff --git a/main.go b/main.go
index 8c37232..eaf9308 100644
--- a/main.go
+++ b/main.go
@@ -7,6 +7,7 @@ import (
 	"flag"
 	"log/slog"
 	"os"
+	"path/filepath"
 	"slices"
 )
 
@@ -53,7 +54,7 @@ func dofile(w *csv.Writer, name string) {
 		return
 	}
 
-	for row := range ismRows(name, ism) {
+	for row := range ismRows(filepath.Base(name), ism) {
 		if err := w.Write(row.csv()); err != nil {
 			log.Error("write row", slog.Any("err", err))
 		}