diff --git a/iguana/iguana_bundles.c b/iguana/iguana_bundles.c
index 3dfbcbe20..e4f66ddb4 100755
--- a/iguana/iguana_bundles.c
+++ b/iguana/iguana_bundles.c
@@ -787,7 +787,7 @@ int32_t iguana_bundleready(struct iguana_info *coin,struct iguana_bundle *bp,int
                         bp->blocks[i] = iguana_blockhashset("ready",coin,bp->bundleheight+i,prevhash2,1);
                         iguana_hash2set(coin,"ready",bp,i,prevhash2);
                         prevhash2 = zero;
-                        if ( (ptr= iguana_bundlefile(coin,fname,&filesize,bp,i)) != 0 )
+                        if ( (ptr= iguana_bundlefile(coin,fname,&filesize,bp,i,0)) != 0 )
                         {
                             if ( iguana_mapchaininit(fname,coin,&R,bp,i,block,ptr,filesize) >= 0 )
                             {
diff --git a/iguana/iguana_ramchain.c b/iguana/iguana_ramchain.c
index b44a56303..cd00e47ae 100755
--- a/iguana/iguana_ramchain.c
+++ b/iguana/iguana_ramchain.c
@@ -2074,7 +2074,11 @@ void iguana_blockunmark(struct iguana_info *coin,struct iguana_block *block,stru
             //printf("checki.%d vs %d mismatch? %s\n",checki,i,fname);
         }
         if ( fname[0] != 0 )
+        {
+            OS_removefile(fname,0);
+            strcat(fname,".tmp");
             OS_removefile(fname,0);
+        }
     }
 }
 
@@ -2118,9 +2122,9 @@ int32_t iguana_oldbundlefiles(struct iguana_info *coin,uint32_t *ipbits,void **p
     return(num);
 }
 
-void *iguana_bundlefile(struct iguana_info *coin,char *fname,long *filesizep,struct iguana_bundle *bp,int32_t bundlei)
+void *iguana_bundlefile(struct iguana_info *coin,char *fname,long *filesizep,struct iguana_bundle *bp,int32_t bundlei,int32_t renameflag)
 {
-    int32_t checki,hdrsi; void *ptr = 0; FILE *fp; static const bits256 zero;
+    int32_t checki,hdrsi; void *ptr = 0; FILE *fp; char renamed[1024]; static const bits256 zero;
     *filesizep = 0;
     fname[0] = 0;
     if ( (checki= iguana_peerfname(coin,&hdrsi,GLOBAL_TMPDIR,fname,0,bp->hashes[bundlei],zero,1,1)) != bundlei || bundlei < 0 || bundlei >= coin->chain->bundlesize )
@@ -2133,6 +2137,12 @@ void *iguana_bundlefile(struct iguana_info *coin,char *fname,long *filesizep,str
     else
     {
         fclose(fp);
+        if ( renameflag != 0 )
+        {
+            sprintf(renamed,"%s.tmp",fname);
+            OS_renamefile(fname,renamed);
+            strcpy(fname,renamed);
+        }
         if ( (ptr= OS_mapfile(fname,filesizep,0)) == 0 )
         {
             printf("error mapping.(%s) bundlei.%d\n",fname,bundlei);
@@ -2148,7 +2158,7 @@ int32_t iguana_bundlefiles(struct iguana_info *coin,uint32_t *ipbits,void **ptrs
     int32_t bundlei,num = 0; char fname[1024];
     for (bundlei=starti; bundlei<=endi; bundlei++)
     {
-        if ( (ptrs[num]= iguana_bundlefile(coin,fname,&filesizes[num],bp,bundlei)) != 0 )
+        if ( (ptrs[num]= iguana_bundlefile(coin,fname,&filesizes[num],bp,bundlei,1)) != 0 )
             num++;
         else
         {
diff --git a/includes/iguana_funcs.h b/includes/iguana_funcs.h
index 7cef48aee..559673299 100755
--- a/includes/iguana_funcs.h
+++ b/includes/iguana_funcs.h
@@ -353,7 +353,7 @@ int64_t iguana_ramchainopen(char *fname,struct iguana_info *coin,struct iguana_r
 int32_t iguana_ramchain_free(struct iguana_info *coin,struct iguana_ramchain *ramchain,int32_t deleteflag);
 void iguana_blocksetcounters(struct iguana_info *coin,struct iguana_block *block,struct iguana_ramchain * ramchain);
 int32_t iguana_ramchain_iterate(struct supernet_info *myinfo,struct iguana_info *coin,struct iguana_ramchain *dest,struct iguana_ramchain *ramchain,struct iguana_bundle *bp,int16_t bundlei);
-void *iguana_bundlefile(struct iguana_info *coin,char *fname,long *filesizep,struct iguana_bundle *bp,int32_t bundlei);
+void *iguana_bundlefile(struct iguana_info *coin,char *fname,long *filesizep,struct iguana_bundle *bp,int32_t bundlei,int32_t renameflag);
 int32_t iguana_mapchaininit(char *fname,struct iguana_info *coin,struct iguana_ramchain *mapchain,struct iguana_bundle *bp,int32_t bundlei,struct iguana_block *block,void *ptr,long filesize);
 void iguana_RTdataset_free(struct iguana_info *coin);
 void iguana_autoextend(struct iguana_info *coin,struct iguana_bundle *bp);