diff --git a/src/autocomplete/QueryMatcher.ts b/src/autocomplete/QueryMatcher.ts
index ea6e0882fd..73bb37ff0f 100644
--- a/src/autocomplete/QueryMatcher.ts
+++ b/src/autocomplete/QueryMatcher.ts
@@ -21,7 +21,7 @@ import {removeHiddenChars} from "matrix-js-sdk/src/utils";
 
 interface IOptions<T extends {}> {
     keys: Array<string | keyof T>;
-    funcs?: Array<(T) => string>;
+    funcs?: Array<(T) => string | string[]>;
     shouldMatchWordsOnly?: boolean;
     // whether to apply unhomoglyph and strip diacritics to fuzz up the search. Defaults to true
     fuzzy?: boolean;
@@ -69,7 +69,12 @@ export default class QueryMatcher<T extends Object> {
 
             if (this._options.funcs) {
                 for (const f of this._options.funcs) {
-                    keyValues.push(f(object));
+                    const v = f(object);
+                    if (Array.isArray(v)) {
+                        keyValues.push(...v);
+                    } else {
+                        keyValues.push(v);
+                    }
                 }
             }
 
diff --git a/src/components/views/dialogs/AddExistingToSpaceDialog.tsx b/src/components/views/dialogs/AddExistingToSpaceDialog.tsx
index faeaa80c15..9a7f96e653 100644
--- a/src/components/views/dialogs/AddExistingToSpaceDialog.tsx
+++ b/src/components/views/dialogs/AddExistingToSpaceDialog.tsx
@@ -92,7 +92,7 @@ export const AddExistingToSpace: React.FC<IAddExistingToSpaceProps> = ({
         if (lcQuery) {
             const matcher = new QueryMatcher<Room>(visibleRooms, {
                 keys: ["name"],
-                funcs: [r => r.getCanonicalAlias() ?? r.getAltAliases()?.[0]],
+                funcs: [r => [r.getCanonicalAlias(), ...r.getAltAliases()].filter(Boolean)],
                 shouldMatchWordsOnly: false,
             });