diff --git a/.changeset/loud-vans-pretend.md b/.changeset/loud-vans-pretend.md
new file mode 100644
index 0000000000..1e2498284b
--- /dev/null
+++ b/.changeset/loud-vans-pretend.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-search': patch
+---
+
+Fix Material-UI warning for search filtering
diff --git a/plugins/search/src/components/Filters/Filters.tsx b/plugins/search/src/components/Filters/Filters.tsx
index 7bd344e12e..888a583547 100644
--- a/plugins/search/src/components/Filters/Filters.tsx
+++ b/plugins/search/src/components/Filters/Filters.tsx
@@ -103,7 +103,7 @@ export const Filters = ({
           >
             {filterOptions.kind.map(filter => (
               <MenuItem
-                selected={filter === 'All'}
+                selected={filter === ''}
                 dense
                 key={filter}
                 value={filter}
diff --git a/plugins/search/src/components/SearchResult/SearchResult.tsx b/plugins/search/src/components/SearchResult/SearchResult.tsx
index 4bbb15e229..f81cd4f66d 100644
--- a/plugins/search/src/components/SearchResult/SearchResult.tsx
+++ b/plugins/search/src/components/SearchResult/SearchResult.tsx
@@ -127,7 +127,7 @@ export const SearchResult = ({ searchQuery }: SearchResultProps) => {
 
   const [showFilters, toggleFilters] = useState(false);
   const [selectedFilters, setSelectedFilters] = useState<FiltersState>({
-    selected: 'All',
+    selected: '',
     checked: [],
   });
 
@@ -146,7 +146,7 @@ export const SearchResult = ({ searchQuery }: SearchResultProps) => {
       // apply filters
 
       // filter on selected
-      if (selectedFilters.selected !== 'All') {
+      if (selectedFilters.selected !== '') {
         withFilters = results.filter((result: Result) =>
           selectedFilters.selected.includes(result.kind),
         );
@@ -192,7 +192,7 @@ export const SearchResult = ({ searchQuery }: SearchResultProps) => {
 
   const resetFilters = () => {
     setSelectedFilters({
-      selected: 'All',
+      selected: '',
       checked: [],
     });
   };
@@ -259,7 +259,7 @@ export const SearchResult = ({ searchQuery }: SearchResultProps) => {
                 searchQuery={searchQuery}
                 numberOfResults={filteredResults.length}
                 numberOfSelectedFilters={
-                  (selectedFilters.selected !== 'All' ? 1 : 0) +
+                  (selectedFilters.selected !== '' ? 1 : 0) +
                   selectedFilters.checked.length
                 }
                 handleToggleFilters={() => toggleFilters(!showFilters)}