Index: src/btree.c
==================================================================
--- src/btree.c
+++ src/btree.c
@@ -3064,11 +3064,11 @@
   }else{
     Pgno nOrig = btreePagecount(pBt);
     Pgno nFree = get4byte(&pBt->pPage1->aData[36]);
     Pgno nFin = finalDbSize(pBt, nOrig, nFree);
 
-    if( nFin<nOrig ){
+    if( nFree>0 ){
       invalidateAllOverflowCache(pBt);
       rc = incrVacuumStep(pBt, nFin, nOrig, 0);
       if( rc==SQLITE_OK ){
         rc = sqlite3PagerWrite(pBt->pPage1->pDbPage);
         put4byte(&pBt->pPage1->aData[28], pBt->nPage);