diff --git a/src/spiffs_hydrogen.c b/src/spiffs_hydrogen.c
index 9ff3e7a..dd79054 100644
--- a/src/spiffs_hydrogen.c
+++ b/src/spiffs_hydrogen.c
@@ -597,13 +597,13 @@ s32_t SPIFFS_lseek(spiffs *fs, spiffs_file fh, s32_t offs, int whence) {
     break;
   }
 
-  if ((offs > fileSize)) {
+  if (offs > fileSize) {
     fd->fdoffset = fileSize;
     res = SPIFFS_ERR_END_OF_OBJECT;
   }
   SPIFFS_API_CHECK_RES_UNLOCK(fs, res);
 
-  spiffs_span_ix data_spix = offs / SPIFFS_DATA_PAGE_SIZE(fs);
+  spiffs_span_ix data_spix = (offs > 0 ? (offs-1) : 0) / SPIFFS_DATA_PAGE_SIZE(fs);
   spiffs_span_ix objix_spix = SPIFFS_OBJ_IX_ENTRY_SPAN_IX(fs, data_spix);
   if (fd->cursor_objix_spix != objix_spix) {
     spiffs_page_ix pix;
diff --git a/src/test/test_bugreports.c b/src/test/test_bugreports.c
index a46ad97..9462794 100644
--- a/src/test/test_bugreports.c
+++ b/src/test/test_bugreports.c
@@ -1160,6 +1160,21 @@ TEST(spiffs_145) {
 } TEST_END
 
 
+TEST(seek_bug_148) {
+  int res;
+#define MAGIC_SIZE_THAT_FAILS 26355 // happens to be SPIFFS_DATA_PAGE_SIZE(FS) * SPIFFS_OBJ_HDR_IX_LEN(FS)
+  fs_reset_specific(0, 0, 64*1024, 4096, 4096, 256);
+  u8_t buf[MAGIC_SIZE_THAT_FAILS];
+  spiffs_file fd = SPIFFS_open(FS, "EVENT", SPIFFS_O_CREAT | SPIFFS_O_RDWR, 0);
+  TEST_CHECK_GT(fd, 0);
+  TEST_CHECK_EQ(SPIFFS_write(FS, fd, &buf, sizeof(buf)), sizeof(buf));
+  TEST_CHECK_EQ(SPIFFS_close(FS, fd), SPIFFS_OK);
+  fd = SPIFFS_open(FS, "EVENT", SPIFFS_O_RDONLY, 0);
+  TEST_CHECK_GT(fd, 0);
+  TEST_CHECK_EQ(SPIFFS_lseek(FS, fd, 0, SEEK_END), MAGIC_SIZE_THAT_FAILS);
+  return TEST_RES_OK;
+} TEST_END
+
 
 SUITE_TESTS(bug_tests)
   ADD_TEST(nodemcu_full_fs_1)
@@ -1174,6 +1189,7 @@ SUITE_TESTS(bug_tests)
   ADD_TEST(spiffs_dup_file_74)
   ADD_TEST(temporal_fd_cache)
   ADD_TEST(spiffs_145)
+  ADD_TEST(seek_bug_148)
   //ADD_TEST(small_free_space)
   ADD_TEST(lots_of_overwrite)
   ADD_TEST_NON_DEFAULT(fuzzer_found_1)