diff --git a/db/corruption_test.cc b/db/corruption_test.cc
index 3fd85953d..4add9b26a 100644
--- a/db/corruption_test.cc
+++ b/db/corruption_test.cc
@@ -369,6 +369,13 @@ TEST_F(CorruptionTest, VerifyChecksumReadahead) {
   ASSERT_GE(senv.random_read_counter_.Read(), 213);
   ASSERT_LE(senv.random_read_counter_.Read(), 447);
 
+  // Test readahead shouldn't break mmap mode (where it should be
+  // disabled).
+  options.allow_mmap_reads = true;
+  Reopen(&options);
+  dbi = static_cast<DBImpl*>(db_);
+  ASSERT_OK(dbi->VerifyChecksum(ro));
+
   CloseDb();
 }
 
diff --git a/table/block_based/block_based_table_reader.cc b/table/block_based/block_based_table_reader.cc
index 27e1d6cf2..0189df36c 100644
--- a/table/block_based/block_based_table_reader.cc
+++ b/table/block_based/block_based_table_reader.cc
@@ -3781,8 +3781,12 @@ Status BlockBasedTable::VerifyChecksumInBlocks(
   size_t readahead_size = (read_options.readahead_size != 0)
                               ? read_options.readahead_size
                               : kMaxAutoReadaheadSize;
-  FilePrefetchBuffer prefetch_buffer(rep_->file.get(), readahead_size,
-                                     readahead_size);
+  // FilePrefetchBuffer doesn't work in mmap mode and readahead is not
+  // needed there.
+  FilePrefetchBuffer prefetch_buffer(
+      rep_->file.get(), readahead_size /* readadhead_size */,
+      readahead_size /* max_readahead_size */,
+      !rep_->ioptions.allow_mmap_reads /* enable */);
 
   for (index_iter->SeekToFirst(); index_iter->Valid(); index_iter->Next()) {
     s = index_iter->status();