diff --git a/crates/cli-support/src/js/mod.rs b/crates/cli-support/src/js/mod.rs
index f3fbb900445..8e30530b19a 100644
--- a/crates/cli-support/src/js/mod.rs
+++ b/crates/cli-support/src/js/mod.rs
@@ -950,7 +950,7 @@ impl<'a> Context<'a> {
             debug,
             encode_as_ascii,
             if self.config.debug {
-                "if (ret.read != arg.length) throw new Error('failed to pass whole string');"
+                "if (ret.read !== arg.length) throw new Error('failed to pass whole string');"
             } else {
                 ""
             },