diff --git a/078 b/078
index 2186749f..db127d75 100755
--- a/078
+++ b/078
@@ -58,8 +58,8 @@ trap "_cleanup; rm -f $tmp.*; exit \$status" 0 1 2 3 15
 
 _require_loop
 
-LOOP_DEV=$tmp.fs
-LOOP_MNT=$tmp.mnt
+LOOP_DEV=$TEST_DIR/$seq.fs
+LOOP_MNT=$TEST_DIR/$seq.mnt
 
 # real QA test starts here
 echo "*** create loop mount point"
@@ -100,7 +100,7 @@ _grow_loop 168024b 1376452608 4096
 # Some other blocksize cases...
 _grow_loop 168024b 1376452608 2048
 _grow_loop 168024b 1376452608 512
-_grow_loop 168024b 168025b 1024 
+_grow_loop 168024b 688230400 1024 
 
 echo "*** all done"
 status=0
diff --git a/078.out b/078.out
index e471f1ab..c1ed10d0 100644
--- a/078.out
+++ b/078.out
@@ -64,7 +64,7 @@ log      =LDEV bsize=XXX blocks=XXX
 realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX
 *** unmount and check
 
-=== GROWFS (from 168024b to 168025b, 1024 blocksize)
+=== GROWFS (from 168024b to 688230400, 1024 blocksize)
 
 *** mkfs loop file (size=168024b)
 meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks
@@ -74,7 +74,7 @@ naming   =VERN bsize=XXX
 log      =LDEV bsize=XXX blocks=XXX
 realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX
 *** extend loop file
-wrote 1024/1024 bytes at offset 344115200
+wrote 1024/1024 bytes at offset 688230400
 *** mount loop filesystem
 *** grow loop filesystem
 meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks