diff --git a/src/include/postmaster/walsummarizer.h b/src/include/postmaster/walsummarizer.h
index d6e61b59ac7..ecb4ea37fba 100644
--- a/src/include/postmaster/walsummarizer.h
+++ b/src/include/postmaster/walsummarizer.h
@@ -16,8 +16,8 @@
 
 #include "access/xlogdefs.h"
 
-extern bool summarize_wal;
-extern int	wal_summary_keep_time;
+extern PGDLLIMPORT bool summarize_wal;
+extern PGDLLIMPORT int wal_summary_keep_time;
 
 extern Size WalSummarizerShmemSize(void);
 extern void WalSummarizerShmemInit(void);
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index e43e6165796..f190e6e5e46 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -385,8 +385,8 @@ typedef struct CkptSortItem
 extern PGDLLIMPORT CkptSortItem *CkptBufferIds;
 
 /* ResourceOwner callbacks to hold buffer I/Os and pins */
-extern const ResourceOwnerDesc buffer_io_resowner_desc;
-extern const ResourceOwnerDesc buffer_pin_resowner_desc;
+extern PGDLLIMPORT const ResourceOwnerDesc buffer_io_resowner_desc;
+extern PGDLLIMPORT const ResourceOwnerDesc buffer_pin_resowner_desc;
 
 /* Convenience wrappers over ResourceOwnerRemember/Forget */
 static inline void