diff --git a/compiler/gen_wasm/src/backend.rs b/compiler/gen_wasm/src/backend.rs
index acd2ce69b4..6cbe46f77b 100644
--- a/compiler/gen_wasm/src/backend.rs
+++ b/compiler/gen_wasm/src/backend.rs
@@ -64,6 +64,7 @@ impl WasmLayout {
             Layout::Builtin(Builtin::EmptyList) => Self::StackMemory(size),
             Layout::Builtin(Builtin::EmptyDict) => Self::StackMemory(size),
             Layout::Builtin(Builtin::EmptySet) => Self::StackMemory(size),
+            Layout::LambdaSet(_) => Self::StackMemory(size),
             Layout::Struct(_) => Self::StackMemory(size),
             Layout::Union(UnionLayout::NonRecursive(_)) => Self::StackMemory(size),
             Layout::Union(UnionLayout::Recursive(_)) => Self::HeapMemory,