diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index bd40713ae8..5102a187a6 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -5325,6 +5325,10 @@ RefPtr<StyleValue> Parser::parse_grid_track_sizes(Vector<ComponentValue> const&
             params.append(Length::make_auto());
             continue;
         }
+        if (component_value.is_block()) {
+            params.append(Length::make_auto());
+            continue;
+        }
         if (component_value.is(Token::Type::Ident) && component_value.token().ident().equals_ignoring_case("auto"sv)) {
             params.append(Length::make_auto());
             continue;