diff --git a/tools/filesystem/filesystem.go b/tools/filesystem/filesystem.go
index 14452ad6..f2aa36aa 100644
--- a/tools/filesystem/filesystem.go
+++ b/tools/filesystem/filesystem.go
@@ -142,7 +142,7 @@ func (s *System) UploadFile(file *File, fileKey string) error {
 	opts := &blob.WriterOptions{
 		ContentType: mt.String(),
 		Metadata: map[string]string{
-			"original_filename": originalName,
+			"original-filename": originalName,
 		},
 	}
 
@@ -184,7 +184,7 @@ func (s *System) UploadMultipart(fh *multipart.FileHeader, fileKey string) error
 	opts := &blob.WriterOptions{
 		ContentType: mt.String(),
 		Metadata: map[string]string{
-			"original_filename": originalName,
+			"original-filename": originalName,
 		},
 	}
 
diff --git a/tools/filesystem/filesystem_test.go b/tools/filesystem/filesystem_test.go
index a3ea1e1e..d8b47b3d 100644
--- a/tools/filesystem/filesystem_test.go
+++ b/tools/filesystem/filesystem_test.go
@@ -177,8 +177,8 @@ func TestFileSystemUploadMultipart(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Failed to fetch file attributes: %v", err)
 	}
-	if name, ok := attrs.Metadata["original_filename"]; !ok || name != "test" {
-		t.Fatalf("Expected original_filename to be %q, got %q", "test", name)
+	if name, ok := attrs.Metadata["original-filename"]; !ok || name != "test" {
+		t.Fatalf("Expected original-filename to be %q, got %q", "test", name)
 	}
 }