diff --git a/src/private_at_functions.h b/src/private_at_functions.h
index d32a47b..51e47a4 100644
--- a/src/private_at_functions.h
+++ b/src/private_at_functions.h
@@ -32,7 +32,7 @@
  * @param path_name The path name for the file or directory, relative to directory_file_descriptor.
  *
  * @returns A pointer to the full path.
- * @retval NULL if an error occurs.
+ * @retval NULL if an error occurred.
  *
  * @since June 2015
  * @author Celine Mercier (celine.mercier@metabarcoding.org)