Index: ext/misc/json1.c
==================================================================
--- ext/misc/json1.c
+++ ext/misc/json1.c
@@ -2020,10 +2020,11 @@
 #endif
   return rc;
 }
 
 
+#ifndef SQLITE_CORE
 #ifdef _WIN32
 __declspec(dllexport)
 #endif
 int sqlite3_json_init(
   sqlite3 *db, 
@@ -2032,6 +2033,7 @@
 ){
   SQLITE_EXTENSION_INIT2(pApi);
   (void)pzErrMsg;  /* Unused parameter */
   return sqlite3Json1Init(db);
 }
+#endif
 #endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_JSON1) */

Index: test/fuzzcheck.c
==================================================================
--- test/fuzzcheck.c
+++ test/fuzzcheck.c
@@ -1124,16 +1124,10 @@
           openFlags |= SQLITE_OPEN_MEMORY;
           zVfs = 0;
         }
         rc = sqlite3_open_v2("main.db", &db, openFlags, zVfs);
         if( rc ) fatalError("cannot open inmem database");
-#ifdef SQLITE_ENABLE_JSON1
-        {
-          extern int sqlite3_json_init(sqlite3*);
-          sqlite3_json_init(db);
-        }
-#endif
         if( cellSzCkFlag ) runSql(db, "PRAGMA cell_size_check=ON", runFlags);
         setAlarm(iTimeout);
 #ifndef SQLITE_OMIT_PROGRESS_CALLBACK
         if( sqlFuzz || vdbeLimitFlag ){
           sqlite3_progress_handler(db, 100000, progressHandler, &vdbeLimitFlag);