diff --git a/templates/sysctlbase.erb b/templates/sysctlbase.erb
index 3529f4e..f9cc007 100644
--- a/templates/sysctlbase.erb
+++ b/templates/sysctlbase.erb
@@ -13,7 +13,7 @@ kernel.core_uses_pid = <%= scope.function_bool2number([@core_uses_pid]) %>
 net.ipv4.tcp_syncookies = <%= scope.function_bool2number([@ipv4_tcp_syncookies]) %>
 
 <% if @disable_netfilter_on_bridges %>
-  <%- if defined?(scope.lookupvar('::eyp_sysctl_net_bridge')) -%>
+  <%- if scope.lookupvar('::eyp_sysctl_net_bridge')!="true" -%>
 # Disable netfilter on bridges.
 net.bridge.bridge-nf-call-ip6tables = 0
 net.bridge.bridge-nf-call-iptables = 0