diff --git a/src/spiffs_hydrogen.c b/src/spiffs_hydrogen.c
index 5ca0e04..235aaaa 100644
--- a/src/spiffs_hydrogen.c
+++ b/src/spiffs_hydrogen.c
@@ -481,7 +481,6 @@ s32_t SPIFFS_write(spiffs *fs, spiffs_file fh, void *buf, s32_t len) {
   if ((fd->flags & SPIFFS_O_APPEND)) {
     fd->fdoffset = fd->size == SPIFFS_UNDEFINED_LEN ? 0 : fd->size;
   }
-
   offset = fd->fdoffset;
 
 #if SPIFFS_CACHE_WR
diff --git a/src/spiffs_nucleus.c b/src/spiffs_nucleus.c
index f2eda25..27ecdff 100644
--- a/src/spiffs_nucleus.c
+++ b/src/spiffs_nucleus.c
@@ -1061,12 +1061,18 @@ void spiffs_cb_object_event(
 #if SPIFFS_TEMPORAL_FD_CACHE
         if (cur_fd->score == 0) continue; // never used fd
 #endif
-        SPIFFS_DBG("       callback: setting fd "_SPIPRIfd":"_SPIPRIid"(fdoffs:"_SPIPRIi" offs:"_SPIPRIi") objix_hdr_pix to "_SPIPRIpg", size:"_SPIPRIi"\n", SPIFFS_FH_OFFS(fs, cur_fd->file_nbr), cur_fd->obj_id, cur_fd->fdoffset, cur_fd->offset, new_pix, new_size);
+        SPIFFS_DBG("       callback: setting fd "_SPIPRIfd":"_SPIPRIid"(fdoffs:"_SPIPRIi" offs:"_SPIPRIi") objix_hdr_pix to "_SPIPRIpg", size:"_SPIPRIi"\n",
+            SPIFFS_FH_OFFS(fs, cur_fd->file_nbr), cur_fd->obj_id, cur_fd->fdoffset, cur_fd->offset, new_pix, new_size);
         cur_fd->objix_hdr_pix = new_pix;
         if (new_size != 0) {
           // update size and offsets for fds to this file
           cur_fd->size = new_size;
           u32_t act_new_size = new_size == SPIFFS_UNDEFINED_LEN ? 0 : new_size;
+#if SPIFFS_CACHE_WR
+          if (act_new_size > 0 && cur_fd->cache_page) {
+            act_new_size = MAX(act_new_size, cur_fd->cache_page->offset + cur_fd->cache_page->size);
+          }
+#endif
           if (cur_fd->offset > act_new_size) {
             cur_fd->offset = act_new_size;
           }
diff --git a/src/test/test_bugreports.c b/src/test/test_bugreports.c
index 3dd4cd8..e9b59d1 100644
--- a/src/test/test_bugreports.c
+++ b/src/test/test_bugreports.c
@@ -1199,6 +1199,37 @@ TEST(remove_release_fd_152) {
   return TEST_RES_OK;
 } TEST_END
 
+TEST(certain_file_size_fail_165) {
+  fs_reset_specific(0, 0, 512*1024, 4*1024, 64*1024, 256);
+  const int NUM = 134;
+  const int SIZ = 200;
+  u8_t buf[SIZ];
+
+  TEST_CHECK_EQ(SPIFFS_creat(FS, "test", 0), SPIFFS_OK);
+  spiffs_file fd = SPIFFS_open(FS, "test", SPIFFS_O_CREAT | SPIFFS_O_WRONLY, 0);
+  TEST_CHECK_GT(fd, 0);
+
+  int i;
+  for (i = 0; i < NUM; i++) {
+    TEST_CHECK_EQ(SPIFFS_write(FS, fd, buf, SIZ), SIZ);
+  }
+  TEST_CHECK_EQ(SPIFFS_close(FS, fd), SPIFFS_OK);
+  fd = SPIFFS_open(FS, "test", SPIFFS_O_RDONLY, 0);
+  TEST_CHECK_GT(fd, 0);
+
+  spiffs_stat s;
+  TEST_CHECK_EQ(SPIFFS_fstat(FS, fd, &s), SPIFFS_OK);
+  TEST_CHECK_EQ(s.size, NUM*SIZ);
+
+  int size = 0;
+  for (i = 0; i < NUM; i++) {
+    size += SPIFFS_read(FS, fd, buf, SIZ);
+  }
+  TEST_CHECK_EQ(size, NUM*SIZ);
+
+  return TEST_RES_OK;
+} TEST_END
+
 
 SUITE_TESTS(bug_tests)
   ADD_TEST(nodemcu_full_fs_1)
@@ -1221,6 +1252,7 @@ SUITE_TESTS(bug_tests)
   ADD_TEST(fuzzer_found_3)
   ADD_TEST(fuzzer_found_4)
   ADD_TEST(remove_release_fd_152)
+  ADD_TEST(certain_file_size_fail_165)
   ADD_TEST_NON_DEFAULT(fuzzer_found_single_1)
   ADD_TEST_NON_DEFAULT(log_afl_test)
   ADD_TEST_NON_DEFAULT(afl_test)
diff --git a/src/test/test_spiffs.c b/src/test/test_spiffs.c
index c7152b5..aa60866 100644
--- a/src/test/test_spiffs.c
+++ b/src/test/test_spiffs.c
@@ -645,6 +645,14 @@ int read_and_verify_fd(spiffs_file fd, char *name) {
     printf("  read_and_verify: could not stat file %s\n", name);
     return res;
   }
+
+  off_t fsize = lseek(pfd, 0, SEEK_END);
+  if (s.size != fsize) {
+    printf("  read_and_verify: size differs, %s spiffs:%d!=fs:%ld\n", name, s.size, fsize);
+    return -1;
+  }
+  lseek(pfd, 0, SEEK_SET);
+
   if (s.size == 0) {
     SPIFFS_close(&__fs, fd);
     close(pfd);