Index: src/pager.c
==================================================================
--- src/pager.c
+++ src/pager.c
@@ -2483,11 +2483,16 @@
     newSize = pPager->pageSize*(i64)nPage;
     if( rc==SQLITE_OK && currentSize!=newSize ){
       if( currentSize>newSize ){
         rc = sqlite3OsTruncate(pPager->fd, newSize);
       }else{
-        rc = sqlite3OsWrite(pPager->fd, "", 1, newSize-1);
+        char *pTmp = pPager->pTmpSpace;
+        memset(pTmp, 0, pPager->pageSize);
+        while( currentSize<newSize ){
+          rc = sqlite3OsWrite(pPager->fd, pTmp, pPager->pageSize, currentSize);
+          currentSize += pPager->pageSize;
+        }
       }
       if( rc==SQLITE_OK ){
         pPager->dbFileSize = nPage;
       }
     }