diff --git a/src/backend/distributed/utils/acquire_lock.c b/src/backend/distributed/utils/acquire_lock.c
index c33ef0376..f414167b3 100644
--- a/src/backend/distributed/utils/acquire_lock.c
+++ b/src/backend/distributed/utils/acquire_lock.c
@@ -39,7 +39,7 @@
 #include "distributed/version_compat.h"
 
 /* forward declaration of background worker entrypoint */
-extern void LockAcquireHelperMain(Datum main_arg);
+extern PGDLLEXPORT void LockAcquireHelperMain(Datum main_arg);
 
 /* forward declaration of helper functions */
 static void lock_acquire_helper_sigterm(SIGNAL_ARGS);
diff --git a/src/include/columnar/columnar.h b/src/include/columnar/columnar.h
index 59a66ab25..64cf745e1 100644
--- a/src/include/columnar/columnar.h
+++ b/src/include/columnar/columnar.h
@@ -274,14 +274,14 @@ extern ChunkData * CreateEmptyChunkData(uint32 columnCount, bool *columnMask,
 										uint32 chunkGroupRowCount);
 extern void FreeChunkData(ChunkData *chunkData);
 extern uint64 ColumnarTableRowCount(Relation relation);
-extern const char * CompressionTypeStr(CompressionType type);
+extern PGDLLEXPORT const char * CompressionTypeStr(CompressionType type);
 
 /* columnar_metadata_tables.c */
-extern void InitColumnarOptions(Oid regclass);
-extern void SetColumnarOptions(Oid regclass, ColumnarOptions *options);
-extern bool DeleteColumnarTableOptions(Oid regclass, bool missingOk);
-extern bool ReadColumnarOptions(Oid regclass, ColumnarOptions *options);
-extern bool IsColumnarTableAmTable(Oid relationId);
+extern PGDLLEXPORT void InitColumnarOptions(Oid regclass);
+extern PGDLLEXPORT void SetColumnarOptions(Oid regclass, ColumnarOptions *options);
+extern PGDLLEXPORT bool DeleteColumnarTableOptions(Oid regclass, bool missingOk);
+extern PGDLLEXPORT bool ReadColumnarOptions(Oid regclass, ColumnarOptions *options);
+extern PGDLLEXPORT bool IsColumnarTableAmTable(Oid relationId);
 
 /* columnar_metadata_tables.c */
 extern void DeleteMetadataRows(RelFileLocator relfilelocator);
diff --git a/src/include/columnar/columnar_tableam.h b/src/include/columnar/columnar_tableam.h
index 04f93fe30..657491ef8 100644
--- a/src/include/columnar/columnar_tableam.h
+++ b/src/include/columnar/columnar_tableam.h
@@ -56,7 +56,7 @@ extern TableScanDesc columnar_beginscan_extended(Relation relation, Snapshot sna
 												 uint32 flags, Bitmapset *attr_needed,
 												 List *scanQual);
 extern int64 ColumnarScanChunkGroupsFiltered(ColumnarScanDesc columnarScanDesc);
-extern bool ColumnarSupportsIndexAM(char *indexAMName);
+extern PGDLLEXPORT bool ColumnarSupportsIndexAM(char *indexAMName);
 extern bool IsColumnarTableAmTable(Oid relationId);
 extern void CheckCitusColumnarCreateExtensionStmt(Node *parseTree);
 extern void CheckCitusColumnarAlterExtensionStmt(Node *parseTree);
diff --git a/src/include/distributed/background_jobs.h b/src/include/distributed/background_jobs.h
index 35745c014..fc714259f 100644
--- a/src/include/distributed/background_jobs.h
+++ b/src/include/distributed/background_jobs.h
@@ -102,8 +102,8 @@ typedef struct ParallelTasksPerNodeEntry
 
 extern BackgroundWorkerHandle * StartCitusBackgroundTaskQueueMonitor(Oid database,
 																	 Oid extensionOwner);
-extern void CitusBackgroundTaskQueueMonitorMain(Datum arg);
-extern void CitusBackgroundTaskExecutor(Datum main_arg);
+extern PGDLLEXPORT void CitusBackgroundTaskQueueMonitorMain(Datum arg);
+extern PGDLLEXPORT void CitusBackgroundTaskExecutor(Datum main_arg);
 
 extern Datum citus_job_cancel(PG_FUNCTION_ARGS);
 extern Datum citus_job_wait(PG_FUNCTION_ARGS);
diff --git a/src/include/distributed/maintenanced.h b/src/include/distributed/maintenanced.h
index a09d89085..de1e68883 100644
--- a/src/include/distributed/maintenanced.h
+++ b/src/include/distributed/maintenanced.h
@@ -29,6 +29,6 @@ extern void MaintenanceDaemonShmemInit(void);
 extern void InitializeMaintenanceDaemonBackend(void);
 extern bool LockCitusExtension(void);
 
-extern void CitusMaintenanceDaemonMain(Datum main_arg);
+extern PGDLLEXPORT void CitusMaintenanceDaemonMain(Datum main_arg);
 
 #endif /* MAINTENANCED_H */
diff --git a/src/include/distributed/metadata_sync.h b/src/include/distributed/metadata_sync.h
index 64e684000..728224fde 100644
--- a/src/include/distributed/metadata_sync.h
+++ b/src/include/distributed/metadata_sync.h
@@ -119,7 +119,7 @@ extern List * InterTableRelationshipOfRelationCommandList(Oid relationId);
 extern List * DetachPartitionCommandList(void);
 extern void SyncNodeMetadataToNodes(void);
 extern BackgroundWorkerHandle * SpawnSyncNodeMetadataToNodes(Oid database, Oid owner);
-extern void SyncNodeMetadataToNodesMain(Datum main_arg);
+extern PGDLLEXPORT void SyncNodeMetadataToNodesMain(Datum main_arg);
 extern void SignalMetadataSyncDaemon(Oid database, int sig);
 extern bool ShouldInitiateMetadataSync(bool *lockFailure);
 extern List * SequenceDependencyCommandList(Oid relationId);
diff --git a/src/include/distributed/shared_library_init.h b/src/include/distributed/shared_library_init.h
index 63a7147af..3764b52fd 100644
--- a/src/include/distributed/shared_library_init.h
+++ b/src/include/distributed/shared_library_init.h
@@ -17,10 +17,10 @@
 #define MAX_SHARD_COUNT 64000
 #define MAX_SHARD_REPLICATION_FACTOR 100
 
-extern ColumnarSupportsIndexAM_type extern_ColumnarSupportsIndexAM;
-extern CompressionTypeStr_type extern_CompressionTypeStr;
-extern IsColumnarTableAmTable_type extern_IsColumnarTableAmTable;
-extern ReadColumnarOptions_type extern_ReadColumnarOptions;
+extern PGDLLEXPORT ColumnarSupportsIndexAM_type extern_ColumnarSupportsIndexAM;
+extern PGDLLEXPORT CompressionTypeStr_type extern_CompressionTypeStr;
+extern PGDLLEXPORT IsColumnarTableAmTable_type extern_IsColumnarTableAmTable;
+extern PGDLLEXPORT ReadColumnarOptions_type extern_ReadColumnarOptions;
 
 extern void StartupCitusBackend(void);
 extern const char * GetClientMinMessageLevelNameForValue(int minMessageLevel);