diff --git a/l10n/en-US/viewer.properties b/l10n/en-US/viewer.properties
index 8c86eed10..85b2fb077 100644
--- a/l10n/en-US/viewer.properties
+++ b/l10n/en-US/viewer.properties
@@ -44,8 +44,8 @@ bookmark_label=Current View
 # Tooltips and alt text for side panel toolbar buttons
 # (the _label strings are alt text for the buttons, the .title strings are
 # tooltips)
-toggle_slider.title=Toggle Slider
-toggle_slider_label=Toggle Slider
+toggle_sidebar.title=Toggle Sidebar
+toggle_sidebar_label=Toggle Sidebar
 outline.title=Show Document Outline
 outline_label=Document Outline
 thumbs.title=Show Thumbnails
diff --git a/web/viewer.html b/web/viewer.html
index 30761ebd8..c4be1d0b5 100644
--- a/web/viewer.html
+++ b/web/viewer.html
@@ -118,8 +118,8 @@ limitations under the License.
           <div id="toolbarContainer">
             <div id="toolbarViewer">
               <div id="toolbarViewerLeft">
-                <button id="sidebarToggle" class="toolbarButton" title="Toggle Sidebar" tabindex="3" data-l10n-id="toggle_slider">
-                  <span data-l10n-id="toggle_slider_label">Toggle Sidebar</span>
+                <button id="sidebarToggle" class="toolbarButton" title="Toggle Sidebar" tabindex="3" data-l10n-id="toggle_sidebar">
+                  <span data-l10n-id="toggle_sidebar_label">Toggle Sidebar</span>
                 </button>
                 <div class="toolbarButtonSpacer"></div>
                 <button id="viewFind" class="toolbarButton group" title="Find in Document" tabindex="4" data-l10n-id="findbar">