diff --git a/CHANGES b/CHANGES
index 5c7fd36f6..ffc18f18e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -12,6 +12,7 @@ Bugs fixed
 
 * #3069: Even if ``'babel'`` key is set to empty string, LaTeX output contains
   one ``\addto\captions...``
+* #3155: Fix JavaScript for `html_sourcelink_suffix` fails with IE and Opera
 
 Release 1.5 beta1 (released Nov 6, 2016)
 ========================================
diff --git a/sphinx/themes/basic/static/searchtools.js_t b/sphinx/themes/basic/static/searchtools.js_t
index f521c3794..3d434853f 100644
--- a/sphinx/themes/basic/static/searchtools.js_t
+++ b/sphinx/themes/basic/static/searchtools.js_t
@@ -261,7 +261,7 @@ var Search = {
           });
         } else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) {
           var suffix = DOCUMENTATION_OPTIONS.SOURCELINK_SUFFIX;
-          $.ajax({url: DOCUMENTATION_OPTIONS.URL_ROOT + '_sources/' + item[5] + (item[5].endsWith(suffix) ? '' : suffix),
+          $.ajax({url: DOCUMENTATION_OPTIONS.URL_ROOT + '_sources/' + item[5] + (item[5].slice(-suffix.length) === suffix ? '' : suffix),
                   dataType: "text",
                   complete: function(jqxhr, textstatus) {
                     var data = jqxhr.responseText;