diff --git a/src/include/access/transam.h b/src/include/access/transam.h
index 6cbb0c82c73..33fd052156f 100644
--- a/src/include/access/transam.h
+++ b/src/include/access/transam.h
@@ -209,7 +209,6 @@ extern PGDLLIMPORT VariableCache ShmemVariableCache;
 extern bool TransactionIdDidCommit(TransactionId transactionId);
 extern bool TransactionIdDidAbort(TransactionId transactionId);
 extern bool TransactionIdIsKnownCompleted(TransactionId transactionId);
-extern void TransactionIdAbort(TransactionId transactionId);
 extern void TransactionIdCommitTree(TransactionId xid, int nxids, TransactionId *xids);
 extern void TransactionIdAsyncCommitTree(TransactionId xid, int nxids, TransactionId *xids, XLogRecPtr lsn);
 extern void TransactionIdAbortTree(TransactionId xid, int nxids, TransactionId *xids);
diff --git a/src/include/commands/tablecmds.h b/src/include/commands/tablecmds.h
index b09afa2775b..ac2bfaff1e4 100644
--- a/src/include/commands/tablecmds.h
+++ b/src/include/commands/tablecmds.h
@@ -60,8 +60,6 @@ extern void SetRelationHasSubclass(Oid relationId, bool relhassubclass);
 
 extern ObjectAddress renameatt(RenameStmt *stmt);
 
-extern ObjectAddress renameatt_type(RenameStmt *stmt);
-
 extern ObjectAddress RenameConstraint(RenameStmt *stmt);
 
 extern ObjectAddress RenameRelation(RenameStmt *stmt);
diff --git a/src/include/utils/dsa.h b/src/include/utils/dsa.h
index ddd3cef8c2f..991b62d28c4 100644
--- a/src/include/utils/dsa.h
+++ b/src/include/utils/dsa.h
@@ -99,8 +99,6 @@ typedef pg_atomic_uint64 dsa_pointer_atomic;
  */
 typedef dsm_handle dsa_handle;
 
-extern void dsa_startup(void);
-
 extern dsa_area *dsa_create(int tranche_id);
 extern dsa_area *dsa_create_in_place(void *place, size_t size,
 									 int tranche_id, dsm_segment *segment);