diff --git a/src/codecext.c b/src/codecext.c
index d26f3e5..15e38f5 100644
--- a/src/codecext.c
+++ b/src/codecext.c
@@ -206,7 +206,7 @@ mcAdjustBtree(Btree* pBt, int nPageSize, int nReserved, int isLegacy)
   return rc;
 }
 
-static int
+SQLITE_PRIVATE int
 sqlite3mcCodecAttach(sqlite3* db, int nDb, const char* zPath, const void* zKey, int nKey)
 {
   /* Attach a key to a database. */