diff --git a/crates/cli-support/src/js/js2rust.rs b/crates/cli-support/src/js/js2rust.rs
index d90fb5e3..701edeeb 100644
--- a/crates/cli-support/src/js/js2rust.rs
+++ b/crates/cli-support/src/js/js2rust.rs
@@ -401,7 +401,7 @@ impl<'a, 'b> Js2Rust<'a, 'b> {
                         name = name
                     ));
                 }
-                self.rust_arguments.push(format!("{} ? 1 : 0", name));
+                self.rust_arguments.push(format!("{}", name));
             }
             Descriptor::Char => {
                 self.js_arguments.push((name.clone(), "string".to_string()));
diff --git a/crates/cli-support/src/js/rust2js.rs b/crates/cli-support/src/js/rust2js.rs
index 769df33c..6e6cc246 100644
--- a/crates/cli-support/src/js/rust2js.rs
+++ b/crates/cli-support/src/js/rust2js.rs
@@ -489,7 +489,7 @@ impl<'a, 'b> Rust2Js<'a, 'b> {
         }
 
         self.ret_expr = match *ty {
-            Descriptor::Boolean => "return JS ? 1 : 0;".to_string(),
+            Descriptor::Boolean => "return JS;".to_string(),
             Descriptor::Char => "return JS.codePointAt(0);".to_string(),
             _ => bail!(
                 "unsupported return type for calling JS function from Rust: {:?}",