diff --git a/crates/polars-expr/src/planner.rs b/crates/polars-expr/src/planner.rs
index 48c91fab0c9e..c7208b10d63f 100644
--- a/crates/polars-expr/src/planner.rs
+++ b/crates/polars-expr/src/planner.rs
@@ -462,7 +462,7 @@ fn create_physical_expr_inner(
                 truthy,
                 falsy,
                 node_to_expr(expression, expr_arena),
-                lit_count < 2,
+                state.allow_threading && lit_count < 2,
                 is_scalar,
             )))
         },