diff --git a/packages/docusaurus-theme-classic/src/theme/NavbarItem/DropdownNavbarItem/Desktop/index.tsx b/packages/docusaurus-theme-classic/src/theme/NavbarItem/DropdownNavbarItem/Desktop/index.tsx
index 0ecc3b9fc6a1..4ecf04338998 100644
--- a/packages/docusaurus-theme-classic/src/theme/NavbarItem/DropdownNavbarItem/Desktop/index.tsx
+++ b/packages/docusaurus-theme-classic/src/theme/NavbarItem/DropdownNavbarItem/Desktop/index.tsx
@@ -64,7 +64,7 @@ export default function DropdownNavbarItemDesktop({
         {...props}
         onClick={props.to ? undefined : (e) => e.preventDefault()}
         onKeyDown={(e) => {
-          if (e.key === 'Enter') {
+          if (e.key === 'Enter' || e.key === ' ') {
             e.preventDefault();
             setShowDropdown(!showDropdown);
           }