diff --git a/scripts/gdl-sync.py b/scripts/gdl-sync.py
index d7e2460..4a44243 100755
--- a/scripts/gdl-sync.py
+++ b/scripts/gdl-sync.py
@@ -484,6 +484,13 @@ def publish(staging: Path, dest: str, dry_run: bool) -> int:
 
 
 def main() -> int:
+    # A sync runs for hours and is normally watched through a redirected log,
+    # where Python's block buffering would withhold progress until it happened
+    # to flush -- and the gallery-dl subprocesses write to the same descriptor
+    # unbuffered, so the log would also interleave out of order.
+    sys.stdout.reconfigure(line_buffering=True)
+    sys.stderr.reconfigure(line_buffering=True)
+
     ap = argparse.ArgumentParser(description=__doc__,
                                  formatter_class=argparse.RawDescriptionHelpFormatter)
     ap.add_argument("--index", required=True,