diff --git a/lib/compiler/src/translator/sections.rs b/lib/compiler/src/translator/sections.rs
index 451360ba836..e5ee7bb7b4b 100644
--- a/lib/compiler/src/translator/sections.rs
+++ b/lib/compiler/src/translator/sections.rs
@@ -61,14 +61,14 @@ pub fn parse_type_section(
 
     for entry in types {
         if let Ok(TypeDef::Func(WPFunctionType { params, returns })) = entry {
-            let sig_params: Vec<Type> = params
+            let sig_params: Box<[Type]> = params
                 .iter()
                 .map(|ty| {
                     wptype_to_type(*ty)
                         .expect("only numeric types are supported in function signatures")
                 })
                 .collect();
-            let sig_returns: Vec<Type> = returns
+            let sig_returns: Box<[Type]> = returns
                 .iter()
                 .map(|ty| {
                     wptype_to_type(*ty)