diff --git a/src/arch/posix/Makefile.inc b/src/arch/posix/Makefile.inc
index 03402bcb8bd9e6aedecf093bd51e5cb4af24ba2b..cb4b46ff2f3b780cc1ad304e3add6f96f9386c28 100644
--- a/src/arch/posix/Makefile.inc
+++ b/src/arch/posix/Makefile.inc
@@ -1,5 +1,7 @@
 # vim:ft=make
 
+COMMON_FLAGS += -DMULTIPASS_ARCH_posix
+
 CC = gcc
 CXX = g++