diff --git a/doc/src/sgml/storage.sgml b/doc/src/sgml/storage.sgml
index c2e927214f..90c3e061b2 100644
--- a/doc/src/sgml/storage.sgml
+++ b/doc/src/sgml/storage.sgml
@@ -83,7 +83,7 @@ Item
 </row>
 
 <row>
- <entry><filename>pg_subtrans</></entry>
+ <entry><filename>pg_serial</></entry>
  <entry>Subdirectory containing information about committed serializable transactions</entry>
 </row>
 
diff --git a/src/backend/storage/lmgr/predicate.c b/src/backend/storage/lmgr/predicate.c
index 5e62ba9e4d..b66fd8678c 100644
--- a/src/backend/storage/lmgr/predicate.c
+++ b/src/backend/storage/lmgr/predicate.c
@@ -3671,7 +3671,7 @@ CheckForSerializableConflictOut(const bool visible, const Relation relation,
 static void
 CheckTargetForConflictsIn(PREDICATELOCKTARGETTAG *targettag)
 {
-	PREDICATELOCKTARGETTAG nexttargettag;
+	PREDICATELOCKTARGETTAG nexttargettag = { 0 };
 	PREDICATELOCKTARGETTAG thistargettag;
 
 	for (;;)