diff --git a/src/spiffs_hydrogen.c b/src/spiffs_hydrogen.c
index 6c31da2..dd9fced 100644
--- a/src/spiffs_hydrogen.c
+++ b/src/spiffs_hydrogen.c
@@ -500,7 +500,7 @@ s32_t SPIFFS_lseek(spiffs *fs, spiffs_file fh, s32_t offs, int whence) {
     break;
   }
 
-  if (offs > (s32_t)fd->size) {
+  if ((offs > (s32_t)fd->size) && (SPIFFS_UNDEFINED_LEN != fd->size)) {
     res = SPIFFS_ERR_END_OF_OBJECT;
   }
   SPIFFS_API_CHECK_RES_UNLOCK(fs, res);