diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
index 34f7b0909a63..af563d0cbd5c 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -82,7 +82,7 @@ namespace __sanitizer {
     uptr *oldlenp;
     void *newval;
     uptr newlen;
-    unsigned long __unused[4];
+    unsigned long ___unused[4];
   };
 #endif // SANITIZER_LINUX