diff --git a/tools/db_crashtest.py b/tools/db_crashtest.py
index 0f58037131..e73664cd32 100644
--- a/tools/db_crashtest.py
+++ b/tools/db_crashtest.py
@@ -66,7 +66,6 @@ def main(argv):
         run_had_errors = False
         additional_opts = ' --disable_seek_compaction=' + \
                           str(random.randint(0, 1)) + \
-                          ' --mmap_read=' + str(random.randint(0, 1)) + \
                           ' --block_size=16384 ' + \
                           ' --cache_size=1048576 ' + \
                           ' --open_files=500000 ' + \
diff --git a/tools/db_crashtest2.py b/tools/db_crashtest2.py
index de599f1b59..704ec2e20e 100644
--- a/tools/db_crashtest2.py
+++ b/tools/db_crashtest2.py
@@ -71,7 +71,6 @@ def main(argv):
         run_had_errors = False
         additional_opts = ' --disable_seek_compaction=' + \
                           str(random.randint(0, 1)) + \
-                          ' --mmap_read=' + str(random.randint(0, 1)) + \
                           ' --block_size=16384 ' + \
                           ' --cache_size=1048576 ' + \
                           ' --open_files=500000 ' + \