diff --git a/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm.cpp b/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm.cpp
index 6475132bcf..7c16d0146d 100644
--- a/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm.cpp
+++ b/xpcom/reflect/xptcall/md/unix/xptcinvoke_arm.cpp
@@ -9,7 +9,7 @@
 
 #include "mozilla/Compiler.h"
 
-#if !defined(__arm__) && !(defined(LINUX)
+#if !defined(__arm__) && !defined(LINUX)
 #error "This code is for Linux ARM only. Check that it works on your system, too.\nBeware that this code is highly compiler dependent."
 #endif