diff --git a/src/bin/pg_upgrade/pg_upgrade.h b/src/bin/pg_upgrade/pg_upgrade.h
index 3922e0a0028..0a1712ba589 100644
--- a/src/bin/pg_upgrade/pg_upgrade.h
+++ b/src/bin/pg_upgrade/pg_upgrade.h
@@ -455,7 +455,7 @@ bool		check_for_data_types_usage(ClusterInfo *cluster,
 									   const char *base_query,
 									   const char *output_path);
 bool		check_for_data_type_usage(ClusterInfo *cluster,
-									  const char *typename,
+									  const char *type_name,
 									  const char *output_path);
 void		new_9_0_populate_pg_largeobject_metadata(ClusterInfo *cluster,
 													 bool check_mode);
diff --git a/src/bin/pg_upgrade/version.c b/src/bin/pg_upgrade/version.c
index 8ec70cd0ea8..2c0e3fc5654 100644
--- a/src/bin/pg_upgrade/version.c
+++ b/src/bin/pg_upgrade/version.c
@@ -236,20 +236,20 @@ check_for_data_types_usage(ClusterInfo *cluster,
  *
  * If so, write a report to the given file name, and return true.
  *
- * typename should be a fully qualified type name.  This is just a
+ * type_name should be a fully qualified type name.  This is just a
  * trivial wrapper around check_for_data_types_usage() to convert a
  * type name into a base query.
  */
 bool
 check_for_data_type_usage(ClusterInfo *cluster,
-						  const char *typename,
+						  const char *type_name,
 						  const char *output_path)
 {
 	bool		found;
 	char	   *base_query;
 
 	base_query = psprintf("SELECT '%s'::pg_catalog.regtype AS oid",
-						  typename);
+						  type_name);
 
 	found = check_for_data_types_usage(cluster, base_query, output_path);