diff --git a/docker/types/containers.py b/docker/types/containers.py
index fd8cab49..b18c1835 100644
--- a/docker/types/containers.py
+++ b/docker/types/containers.py
@@ -233,7 +233,7 @@ class HostConfig(dict):
         if read_only is not None:
             self['ReadonlyRootfs'] = read_only
 
-        if dns_search:
+        if dns_search is not None:
             self['DnsSearch'] = dns_search
 
         if network_mode: