diff --git a/setup.py b/setup.py
index 93e19c3..73b4e03 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,8 @@ setup(name="magic-wormhole",
           "twisted[tls]",
           "autobahn[twisted] >= 0.14.1",
           "automat",
-          "hkdf", "tqdm",
+          "hkdf",
+          "tqdm >= 4.13.0", # 4.13.0 fixes crash on NetBSD
           "click",
           "humanize",
           "ipaddress",