diff --git a/tools/db_crashtest.py b/tools/db_crashtest.py
index 16603cfd6..2979a0508 100644
--- a/tools/db_crashtest.py
+++ b/tools/db_crashtest.py
@@ -84,9 +84,9 @@ def main(argv):
             --cache_size=1048576
             --open_files=500000
             --verify_checksum=1
-            --sync=%s
+            --sync=0
             --disable_wal=0
-            --disable_data_sync=%s
+            --disable_data_sync=1
             --target_file_size_base=2097152
             --target_file_size_multiplier=2
             --max_write_buffer_number=3
@@ -101,8 +101,6 @@ def main(argv):
                    tempfile.mkdtemp(),
                    random.randint(0, 1),
                    random.randint(0, 1),
-                   random.randint(0, 1),
-                   random.randint(0, 1),
                    random.randint(0, 1)))
 
         child = subprocess.Popen([cmd],
diff --git a/tools/db_crashtest2.py b/tools/db_crashtest2.py
index 6a28a0ba4..68cc42cf3 100644
--- a/tools/db_crashtest2.py
+++ b/tools/db_crashtest2.py
@@ -98,9 +98,9 @@ def main(argv):
             --cache_size=1048576
             --open_files=500000
             --verify_checksum=1
-            --sync=%s
+            --sync=0
             --disable_wal=0
-            --disable_data_sync=%s
+            --disable_data_sync=1
             --target_file_size_base=2097152
             --target_file_size_multiplier=2
             --max_write_buffer_number=3
@@ -117,8 +117,6 @@ def main(argv):
                    random.randint(0, 1),
                    random.randint(0, 1),
                    random.randint(0, 1),
-                   random.randint(0, 1),
-                   random.randint(0, 1),
                    additional_opts))
 
         print "Running:" + cmd + "\n"