diff --git a/src/root/build-deps.tt b/src/root/build-deps.tt
index 157b113e..f15342fa 100644
--- a/src/root/build-deps.tt
+++ b/src/root/build-deps.tt
@@ -4,6 +4,6 @@
 
 <div class="dep-tree">
   <ul class="tree">
-    [% INCLUDE renderNode node=buildTimeGraph %]
+    [% INCLUDE renderNode node=buildTimeGraph isRoot=1 %]
   </ul>
 </div>
diff --git a/src/root/build.tt b/src/root/build.tt
index 027ce3e4..93a02e0f 100644
--- a/src/root/build.tt
+++ b/src/root/build.tt
@@ -481,11 +481,11 @@ END;
 [% END %]
 
   [% IF drvAvailable %]
-    [% INCLUDE makeLazyTab tabName="tabs-build-deps" uri=c.uri_for('/build' build.id 'build-deps') %]
+    [% INCLUDE makeLazyTab tabName="tabs-build-deps" uri=c.uri_for('/build' build.id 'build-deps') callback="makeTreeCollapsible" %]
   [% END %]
 
   [% IF available %]
-    [% INCLUDE makeLazyTab tabName="tabs-runtime-deps" uri=c.uri_for('/build' build.id 'runtime-deps') %]
+    [% INCLUDE makeLazyTab tabName="tabs-runtime-deps" uri=c.uri_for('/build' build.id 'runtime-deps') callback="makeTreeCollapsible" %]
   [% END %]
 
   <div id="tabs-runcommandlogs" class="tab-pane">
diff --git a/src/root/common.tt b/src/root/common.tt
index 6b4e406e..32d6c8cc 100644
--- a/src/root/common.tt
+++ b/src/root/common.tt
@@ -520,7 +520,11 @@ BLOCK makeLazyTab %]
     <center><span class="spinner-border spinner-border-sm"/></center>
   </div>
   <script>
-    $(function() { makeLazyTab("[% tabName %]", "[% uri %]"); });
+    [% IF callback.defined %]
+    $(function() { makeLazyTab("[% tabName %]", "[% uri %]", [% callback %] ); });
+    [% ELSE %]
+    $(function() { makeLazyTab("[% tabName %]", "[% uri %]", null ); });
+    [% END %]
   </script>
 [% END;
 
diff --git a/src/root/deps.tt b/src/root/deps.tt
index a2c1fbba..6daa9725 100644
--- a/src/root/deps.tt
+++ b/src/root/deps.tt
@@ -19,9 +19,16 @@
           <tt>[% node.name %]</tt> (<em>no info</em>)
         [% END %]
       </span></span>
+      [% IF isRoot %]
+      <span class="dep-tree-buttons">
+        (<a href="#" class="tree-collapse-all">collapse all</a>
+        &ndash;
+        <a href="#" class="tree-expand-all">expand all</a>)
+      </span>
+      [% END %]
       [% IF node.refs.size > 0 %]
         <ul class="subtree">
-          [% FOREACH ref IN node.refs; INCLUDE renderNode node=ref; END %]
+          [% FOREACH ref IN node.refs; INCLUDE renderNode node=ref isRoot=0; END %]
         </ul>
       [% END %]
     [% END %]
diff --git a/src/root/static/css/hydra.css b/src/root/static/css/hydra.css
index 3b50d246..aac3f1ea 100644
--- a/src/root/static/css/hydra.css
+++ b/src/root/static/css/hydra.css
@@ -33,6 +33,11 @@ span:target > span.dep-tree-line {
     font-weight: bold;
 }
 
+span.dep-tree-buttons {
+    font-style: italic;
+    padding-left: 10px;
+}
+
 span.disabled-project, span.disabled-jobset, span.disabled-job {
     text-decoration: line-through;
 }
diff --git a/src/root/static/css/tree.css b/src/root/static/css/tree.css
index 71df2f12..e80f6871 100644
--- a/src/root/static/css/tree.css
+++ b/src/root/static/css/tree.css
@@ -9,6 +9,7 @@ ul.tree, ul.subtree {
 ul.subtree > li {
     position: relative;
     padding-left: 2.0em;
+    line-height: 140%;
     border-left: 0.1em solid #6185a0;
 }
 
diff --git a/src/root/static/js/common.js b/src/root/static/js/common.js
index 433c06d7..c51f769a 100644
--- a/src/root/static/js/common.js
+++ b/src/root/static/js/common.js
@@ -1,10 +1,9 @@
-$(document).ready(function() {
-
+function makeTreeCollapsible(tab) {
     /*** Tree toggles in logfiles. ***/
 
     /* Set the appearance of the toggle depending on whether the
        corresponding subtree is initially shown or hidden. */
-    $(".tree-toggle").map(function() {
+    tab.find(".tree-toggle").map(function() {
         if ($(this).siblings("ul:hidden").length == 0) {
             $(this).text("-");
         } else {
@@ -13,7 +12,7 @@ $(document).ready(function() {
     });
 
     /* When a toggle is clicked, show or hide the subtree. */
-    $(".tree-toggle").click(function() {
+    tab.find(".tree-toggle").click(function() {
         if ($(this).siblings("ul:hidden").length != 0) {
             $(this).siblings("ul").show();
             $(this).text("-");
@@ -24,21 +23,23 @@ $(document).ready(function() {
     });
 
     /* Implementation of the expand all link. */
-    $(".tree-expand-all").click(function() {
-        $(".tree-toggle", $(this).parent().siblings(".tree")).map(function() {
+    tab.find(".tree-expand-all").click(function() {
+        tab.find(".tree-toggle", $(this).parent().siblings(".tree")).map(function() {
             $(this).siblings("ul").show();
             $(this).text("-");
         });
     });
 
     /* Implementation of the collapse all link. */
-    $(".tree-collapse-all").click(function() {
-        $(".tree-toggle", $(this).parent().siblings(".tree")).map(function() {
+    tab.find(".tree-collapse-all").click(function() {
+        tab.find(".tree-toggle", $(this).parent().siblings(".tree")).map(function() {
             $(this).siblings("ul").hide();
             $(this).text("+");
         });
     });
+}
 
+$(document).ready(function() {
     $("table.clickable-rows").click(function(event) {
         if ($(event.target).closest("a").length) return;
         link = $(event.target).parents("tr").find("a.row-link");
@@ -132,7 +133,7 @@ $(document).ready(function() {
 
 var tabsLoaded = {};
 
-function makeLazyTab(tabName, uri) {
+function makeLazyTab(tabName, uri, callback) {
     $('.nav-tabs').bind('show.bs.tab', function(e) {
         var pattern = /#.+/gi;
         var id = e.target.toString().match(pattern)[0];
@@ -140,11 +141,15 @@ function makeLazyTab(tabName, uri) {
           tabsLoaded[id] = 1;
           $('#' + tabName).load(uri, function(response, status, xhr) {
             var lazy = xhr.getResponseHeader("X-Hydra-Lazy") === "Yes";
+            var tab = $('#' + tabName);
             if (status == "error" && !lazy) {
-              $('#' + tabName).html("<div class='alert alert-error'>Error loading tab: " + xhr.status + " " + xhr.statusText + "</div>");
+              tab.html("<div class='alert alert-error'>Error loading tab: " + xhr.status + " " + xhr.statusText + "</div>");
             }
             else {
-              $('#' + tabName).html(response);
+              tab.html(response);
+              if (callback) {
+                callback(tab);
+              }
             }
           });
         }