diff -r a46457045d66 -r d02120b7a34f src/cpu/zero/vm/assembler_zero.cpp
--- a/src/cpu/zero/vm/assembler_zero.cpp	Thu Dec 20 14:17:52 2012 -0800
+++ b/src/cpu/zero/vm/assembler_zero.cpp	Thu Dec 20 18:53:44 2012 -0800
@@ -58,7 +58,7 @@
 
 void MacroAssembler::align(int modulus) {
   while (offset() % modulus != 0)
-    emit_byte(AbstractAssembler::code_fill_byte());
+    emit_int8(AbstractAssembler::code_fill_byte());
 }
 
 void MacroAssembler::bang_stack_with_offset(int offset) {