diff --git a/crates/red_knot_python_semantic/src/types.rs b/crates/red_knot_python_semantic/src/types.rs
index a96596330f..c1ce738c44 100644
--- a/crates/red_knot_python_semantic/src/types.rs
+++ b/crates/red_knot_python_semantic/src/types.rs
@@ -138,7 +138,8 @@ fn symbol<'db>(db: &'db dyn Db, scope: ScopeId<'db>, name: &str) -> Symbol<'db>
         return Symbol::Type(Type::BooleanLiteral(true), Boundness::Bound);
     }
     if name == "platform"
-        && file_to_module(db, scope.file(db)).is_some_and(|module| module.name() == "sys")
+        && file_to_module(db, scope.file(db))
+            .is_some_and(|module| module.is_known(KnownModule::Sys))
     {
         match Program::get(db).python_platform(db) {
             crate::PythonPlatform::Identifier(platform) => {