diff --git a/src/librustdoc/html/static/js/search.js b/src/librustdoc/html/static/js/search.js
index 7754d626e20..b596adf32c6 100644
--- a/src/librustdoc/html/static/js/search.js
+++ b/src/librustdoc/html/static/js/search.js
@@ -119,7 +119,7 @@ window.initSearch = rawSearchIndex => {
      */
     let searchIndex;
     let currentResults;
-    const ALIASES = {};
+    const ALIASES = Object.create(null);
     const params = searchState.getQueryStringParams();
 
     // Populate search bar with query string search term when provided,
@@ -1953,7 +1953,7 @@ window.initSearch = rawSearchIndex => {
             }
 
             if (aliases) {
-                ALIASES[crate] = {};
+                ALIASES[crate] = Object.create(null);
                 for (const alias_name in aliases) {
                     if (!hasOwnPropertyRustdoc(aliases, alias_name)) {
                         continue;
diff --git a/src/test/rustdoc-js/prototype.js b/src/test/rustdoc-js/prototype.js
new file mode 100644
index 00000000000..2f1d841c3be
--- /dev/null
+++ b/src/test/rustdoc-js/prototype.js
@@ -0,0 +1,16 @@
+// exact-check
+
+const QUERY = ['constructor', '__proto__'];
+
+const EXPECTED = [
+    {
+        'others': [],
+        'returned': [],
+        'in_args': [],
+    },
+    {
+        'others': [],
+        'returned': [],
+        'in_args': [],
+    },
+];
diff --git a/src/test/rustdoc-js/prototype.rs b/src/test/rustdoc-js/prototype.rs
new file mode 100644
index 00000000000..5f6d73cc196
--- /dev/null
+++ b/src/test/rustdoc-js/prototype.rs
@@ -0,0 +1,4 @@
+// The alias needed to be there to reproduce the bug
+// that used to be here.
+#[doc(alias="other_alias")]
+pub fn something_else() {}