diff --git a/devtools/client/preferences/devtools-client.js b/devtools/client/preferences/devtools-client.js
index c1caf42fb47e..47a2c663e335 100644
--- a/devtools/client/preferences/devtools-client.js
+++ b/devtools/client/preferences/devtools-client.js
@@ -172,6 +172,8 @@ pref("devtools.application.enabled", false);
 // The default Network Monitor UI settings
 pref("devtools.netmonitor.panes-network-details-width", 550);
 pref("devtools.netmonitor.panes-network-details-height", 450);
+pref("devtools.netmonitor.panes-search-width", 550);
+pref("devtools.netmonitor.panes-search-height", 450);
 pref("devtools.netmonitor.filters", "[\"all\"]");
 pref("devtools.netmonitor.visibleColumns",
   "[\"status\",\"method\",\"domain\",\"file\",\"cause\",\"type\",\"transferred\",\"contentSize\",\"waterfall\"]"