diff --git a/src/comp/back/x86.rs b/src/comp/back/x86.rs
index 86631e93bf12..0a5fc506977a 100644
--- a/src/comp/back/x86.rs
+++ b/src/comp/back/x86.rs
@@ -131,7 +131,7 @@ fn get_module_asm() -> str {
     auto align = 4;
 
     auto prefix = "";
-    if (target_os() == "macos") {
+    if (_str.eq(target_os(), "macos")) {
         prefix = "_";
     }