diff --git a/cbconvert.go b/cbconvert.go
index 7bb48b4..e164b9c 100644
--- a/cbconvert.go
+++ b/cbconvert.go
@@ -472,6 +472,11 @@ func (c *Convertor) convertDirectory(dirPath string) error {
 					return fmt.Errorf("convertDirectory: %w", err)
 				}
 
+				err = file.Close()
+				if err != nil {
+					return fmt.Errorf("convertDirectory: %w", err)
+				}
+
 				continue
 			}