diff --git a/examples/demo/src/themes/softTheme.ts b/examples/demo/src/themes/softTheme.ts
index d94fa763dd8..78b0ed491f1 100644
--- a/examples/demo/src/themes/softTheme.ts
+++ b/examples/demo/src/themes/softTheme.ts
@@ -31,6 +31,9 @@ export const softDarkTheme = {
                 },
             },
         },
+        MuiFilledInput: {
+            styleOverrides: undefined,
+        },
         MuiAppBar: {
             styleOverrides: {
                 colorSecondary: {