diff --git a/scripts/patchsqlite3.sh b/scripts/patchsqlite3.sh
index 97f3e47..d6d2786 100644
--- a/scripts/patchsqlite3.sh
+++ b/scripts/patchsqlite3.sh
@@ -28,4 +28,4 @@ sed 's/sqlite3_file_control\(.*SQLITE_FCNTL_PRAGMA\)/sqlite3mcFileControlPragma\
     | sed '/^  }else if( USEFETCH(pPager) ){/c \  }else if( USEFETCH(pPager) && sqlite3mcPagerHasCodec(pPager) == 0 ){' \
     | sed '/^  if( rc!=SQLITE_OK ) memset(&mem0, 0, sizeof(mem0));/a \\n  \/\* Initialize wrapper for memory management.\*\/\n  if( rc==SQLITE_OK ) {\n    sqlite3mcInitMemoryMethods();\n  }\n' \
     | sed '/Lock the source database handle./i \  \/\* Check whether databases are compatible with backup \*\/\n  if (!sqlite3mcIsBackupSupported(pSrcDb, zSrcDb, pDestDb, zDestDb)){\n    sqlite3ErrorWithMsg(pDestDb, SQLITE_ERROR, \"backup is not supported with incompatible source and target databases\");\n    return NULL;\n  }\n' \
-    | sed '/nRes = sqlite3BtreeGetRequestedReserve(pMain)/a \\n  \/\* A VACUUM cannot change the pagesize of an encrypted database. \*\/\n  if( db->nextPagesize ){\n    extern void sqlite3mcCodecGetKey(sqlite3*, int, void**, int*);\n    int nKey;\n    char *zKey;\n    sqlite3mcCodecGetKey(db, iDb, (void**)&zKey, &nKey);\n    if( nKey ) db->nextPagesize = 0;\n  }' \
+    | sed '/nRes = sqlite3BtreeGetRequestedReserve(pMain)/a \\n  \/\* A VACUUM cannot change the pagesize of an encrypted database. \*\/\n  if( db->nextPagesize ){\n    static void sqlite3mcCodecGetKey(sqlite3*, int, void**, int*);\n    int nKey;\n    char *zKey;\n    sqlite3mcCodecGetKey(db, iDb, (void**)&zKey, &nKey);\n    if( nKey ) db->nextPagesize = 0;\n  }' \
diff --git a/src/sqlite3patched.c b/src/sqlite3patched.c
index fb53c9d..7860c12 100644
--- a/src/sqlite3patched.c
+++ b/src/sqlite3patched.c
@@ -156218,7 +156218,7 @@ SQLITE_PRIVATE SQLITE_NOINLINE int sqlite3RunVacuum(
 
   /* A VACUUM cannot change the pagesize of an encrypted database. */
   if( db->nextPagesize ){
-    extern void sqlite3mcCodecGetKey(sqlite3*, int, void**, int*);
+    static void sqlite3mcCodecGetKey(sqlite3*, int, void**, int*);
     int nKey;
     char *zKey;
     sqlite3mcCodecGetKey(db, iDb, (void**)&zKey, &nKey);