Index: src/mutex.c
==================================================================
--- src/mutex.c
+++ src/mutex.c
@@ -132,11 +132,11 @@
   assert( SQLITE_MUTEX_RECURSIVE<2 );
   assert( SQLITE_MUTEX_FAST<2 );
   assert( SQLITE_MUTEX_WARNONCONTENTION<2 );
 
 #if SQLITE_ENABLE_API_ARMOR
-  if( p->iType<2 ){
+  if( ((CheckMutex*)p)->iType<2 )
 #endif
   {
     CheckMutex *pCheck = (CheckMutex*)p;
     pGlobalMutexMethods->xMutexFree(pCheck->mutex);
     sqlite3_free(pCheck);