--- a/js/src/irregexp/NativeRegExpMacroAssembler.cpp
+++ b/js/src/irregexp/NativeRegExpMacroAssembler.cpp
@@ -1315,17 +1315,17 @@ NativeRegExpMacroAssembler::CheckSpecial
       default:
         return false;
     }
 }
 
 bool
 NativeRegExpMacroAssembler::CanReadUnaligned()
 {
-#if defined(JS_CODEGEN_MIPS)
+#if defined(JS_CODEGEN_ARM) || defined(JS_CODEGEN_MIPS)
     return false;
 #else
     return true;
 #endif
 }
 
 const uint8_t
 NativeRegExpMacroAssembler::word_character_map[] =