diff --git a/src/include/common/pg_lzcompress.h b/src/include/common/pg_lzcompress.h
index 3e53fbe97bd..2a12b33a008 100644
--- a/src/include/common/pg_lzcompress.h
+++ b/src/include/common/pg_lzcompress.h
@@ -75,8 +75,8 @@ typedef struct PGLZ_Strategy
  *									output would be larger than input.
  * ----------
  */
-extern const PGLZ_Strategy *const PGLZ_strategy_default;
-extern const PGLZ_Strategy *const PGLZ_strategy_always;
+extern PGDLLIMPORT const PGLZ_Strategy *const PGLZ_strategy_default;
+extern PGDLLIMPORT const PGLZ_Strategy *const PGLZ_strategy_always;
 
 
 /* ----------