diff --git a/miniffs.c b/miniffs.c
index e2c94b9..8b6d76c 100644
--- a/miniffs.c
+++ b/miniffs.c
@@ -129,7 +129,7 @@ int miniffs_seek(file_t *file, size_t offset, int whence)
         file->offset += offset;
         break;
     case MFFS_SEEK_END:
-        file->offset = file->fent->size - offset;
+        file->offset = file->fent->size - 1 - offset;
         break;
     }
     miniffs_seterror(MINIFFS_NOERROR);