diff --git a/src/librustdoc/html/static/source-script.js b/src/librustdoc/html/static/source-script.js
index cfbfe6675f52b..6805f2a266f09 100644
--- a/src/librustdoc/html/static/source-script.js
+++ b/src/librustdoc/html/static/source-script.js
@@ -140,4 +140,9 @@ function createSourceSidebar() {
     });
 
     main.insertBefore(sidebar, main.firstChild);
+    // Focus on the current file in the source files sidebar.
+    var selected_elem = sidebar.getElementsByClassName("selected")[0];
+    if (typeof selected_elem !== "undefined") {
+        selected_elem.focus();
+    }
 }