diff --git a/lfs.c b/lfs.c
index ca6d587..c554135 100644
--- a/lfs.c
+++ b/lfs.c
@@ -194,7 +194,7 @@ static int lfs_bd_prog(lfs_t *lfs,
             off += diff;
             size -= diff;
 
-            pcache->size = off - pcache->off;
+            pcache->size = lfs_max(pcache->size, off - pcache->off);
             if (pcache->size == lfs->cfg->cache_size) {
                 // eagerly flush out pcache if we fill up
                 int err = lfs_bd_flush(lfs, pcache, rcache, validate);
@@ -617,7 +617,7 @@ static int lfs_dir_getread(lfs_t *lfs, const lfs_mdir_t *dir,
                 lfs->cfg->cache_size);
         int err = lfs_dir_getslice(lfs, dir, gmask, gtag,
                 rcache->off, rcache->buffer, rcache->size);
-        if (err) {
+        if (err < 0) {
             return err;
         }
     }
diff --git a/tests/test_seek.sh b/tests/test_seek.sh
index 1803317..97a6f15 100755
--- a/tests/test_seek.sh
+++ b/tests/test_seek.sh
@@ -395,6 +395,16 @@ tests/test.py << TEST
         lfs_file_sync(&lfs, &file[0]) => 0;
         lfs_file_tell(&lfs, &file[0]) => i+1;
         lfs_file_size(&lfs, &file[0]) => $SIZE;
+        if (i < $SIZE-2) {
+            uint8_t c[3];
+            lfs_file_seek(&lfs, &file[0], -1, LFS_SEEK_CUR) => i;
+            lfs_file_read(&lfs, &file[0], &c, 3) => 3;
+            lfs_file_tell(&lfs, &file[0]) => i+3;
+            lfs_file_size(&lfs, &file[0]) => $SIZE;
+            lfs_file_seek(&lfs, &file[0], i+1, LFS_SEEK_SET) => i+1;
+            lfs_file_tell(&lfs, &file[0]) => i+1;
+            lfs_file_size(&lfs, &file[0]) => $SIZE;
+        }
     }
 
     lfs_file_seek(&lfs, &file[0], 0, LFS_SEEK_SET) => 0;