diff --git a/godot-codegen/src/conv/type_conversions.rs b/godot-codegen/src/conv/type_conversions.rs
index cd50585db..1d436048b 100644
--- a/godot-codegen/src/conv/type_conversions.rs
+++ b/godot-codegen/src/conv/type_conversions.rs
@@ -462,16 +462,28 @@ fn gdscript_to_rust_expr() {
     // The 'None' type is used to simulate absence of type information. Some tests are commented out, because this functionality is not
     // yet needed. If we ever want to reuse to_rust_expr() in other contexts, we could re-enable them.
 
-    let ty_int = RustTy::BuiltinIdent { ty: ident("i64") };
+    let ty_int = RustTy::BuiltinIdent {
+        ty: ident("i64"),
+        is_copy: true,
+    };
     let ty_int = Some(&ty_int);
 
-    let ty_int_u16 = RustTy::BuiltinIdent { ty: ident("u16") };
+    let ty_int_u16 = RustTy::BuiltinIdent {
+        ty: ident("u16"),
+        is_copy: true,
+    };
     let ty_int_u16 = Some(&ty_int_u16);
 
-    let ty_float = RustTy::BuiltinIdent { ty: ident("f64") };
+    let ty_float = RustTy::BuiltinIdent {
+        ty: ident("f64"),
+        is_copy: true,
+    };
     let ty_float = Some(&ty_float);
 
-    let ty_float_f32 = RustTy::BuiltinIdent { ty: ident("f32") };
+    let ty_float_f32 = RustTy::BuiltinIdent {
+        ty: ident("f32"),
+        is_copy: true,
+    };
     let ty_float_f32 = Some(&ty_float_f32);
 
     let ty_enum = RustTy::EngineEnum {
@@ -490,6 +502,7 @@ fn gdscript_to_rust_expr() {
 
     let ty_variant = RustTy::BuiltinIdent {
         ty: ident("Variant"),
+        is_copy: false,
     };
     let ty_variant = Some(&ty_variant);
 
@@ -501,16 +514,19 @@ fn gdscript_to_rust_expr() {
 
     let ty_string = RustTy::BuiltinIdent {
         ty: ident("GString"),
+        is_copy: true,
     };
     let ty_string = Some(&ty_string);
 
     let ty_stringname = RustTy::BuiltinIdent {
         ty: ident("StringName"),
+        is_copy: true,
     };
     let ty_stringname = Some(&ty_stringname);
 
     let ty_nodepath = RustTy::BuiltinIdent {
         ty: ident("NodePath"),
+        is_copy: true,
     };
     let ty_nodepath = Some(&ty_nodepath);