diff --git a/tools/db_crashtest.py b/tools/db_crashtest.py
index 6ef20ff40..6e72ade59 100644
--- a/tools/db_crashtest.py
+++ b/tools/db_crashtest.py
@@ -103,7 +103,7 @@ def main(argv):
                 --sync=0
                 --progress_reports=0
                 --disable_wal=0
-                --disable_data_sync=1
+                --disable_data_sync=0
                 --target_file_size_base=16777216
                 --target_file_size_multiplier=1
                 --max_write_buffer_number=3
@@ -143,7 +143,7 @@ def main(argv):
                 --sync=0
                 --progress_reports=0
                 --disable_wal=0
-                --disable_data_sync=1
+                --disable_data_sync=0
                 --target_file_size_base=2097152
                 --target_file_size_multiplier=2
                 --max_write_buffer_number=3
diff --git a/tools/db_crashtest2.py b/tools/db_crashtest2.py
index a74053ef7..4e94a01fa 100644
--- a/tools/db_crashtest2.py
+++ b/tools/db_crashtest2.py
@@ -124,7 +124,7 @@ def main(argv):
                 --sync=0
                 --progress_reports=0
                 --disable_wal=0
-                --disable_data_sync=1
+                --disable_data_sync=0
                 --target_file_size_base=16777216
                 --target_file_size_multiplier=1
                 --max_write_buffer_number=3
@@ -163,7 +163,7 @@ def main(argv):
                 --sync=0
                 --progress_reports=0
                 --disable_wal=0
-                --disable_data_sync=1
+                --disable_data_sync=0
                 --target_file_size_base=2097152
                 --target_file_size_multiplier=2
                 --max_write_buffer_number=3