diff --git a/crates/wasm-bindgen-macro/src/lib.rs b/crates/wasm-bindgen-macro/src/lib.rs
index ea65d320..bab7db43 100644
--- a/crates/wasm-bindgen-macro/src/lib.rs
+++ b/crates/wasm-bindgen-macro/src/lib.rs
@@ -169,7 +169,7 @@ fn bindgen(export_name: &syn::Lit,
                 args.push(my_quote! { #ident: #i });
             }
             ast::Type::BorrowedStr => {
-                malloc = !MALLOC_GENERATED.swap(true, Ordering::SeqCst);
+                malloc = malloc || !MALLOC_GENERATED.swap(true, Ordering::SeqCst);
                 let ptr = syn::Ident::from(format!("arg{}_ptr", i));
                 let len = syn::Ident::from(format!("arg{}_len", i));
                 args.push(my_quote! { #ptr: *const u8 });
@@ -182,7 +182,7 @@ fn bindgen(export_name: &syn::Lit,
                 });
             }
             ast::Type::String => {
-                malloc = !MALLOC_GENERATED.swap(true, Ordering::SeqCst);
+                malloc = malloc || !MALLOC_GENERATED.swap(true, Ordering::SeqCst);
                 let ptr = syn::Ident::from(format!("arg{}_ptr", i));
                 let len = syn::Ident::from(format!("arg{}_len", i));
                 args.push(my_quote! { #ptr: *mut u8 });
diff --git a/tests/simple.rs b/tests/simple.rs
index 1a8e4d25..74eedfad 100644
--- a/tests/simple.rs
+++ b/tests/simple.rs
@@ -48,14 +48,14 @@ fn string_arguments() {
             use wasm_bindgen::prelude::*;
 
             wasm_bindgen! {
-                pub fn assert_foo(a: &str) {
-                    assert_eq!(a, "foo");
-                }
-
                 pub fn assert_foo_and_bar(a: &str, b: &str) {
                     assert_eq!(a, "foo2");
                     assert_eq!(b, "bar");
                 }
+
+                pub fn assert_foo(a: &str) {
+                    assert_eq!(a, "foo");
+                }
             }
         "#)
         .file("test.js", r#"