diff --git a/sys/conf/options b/sys/conf/options
index 616fe126dea..e49a89d6e77 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -158,6 +158,7 @@ WLCACHE		opt_wavelan.h
 WLDEBUG		opt_wavelan.h
 
 # POSIX kernel options
+P1003_1B_MQUEUE			opt_posix.h
 P1003_1B_SEMAPHORES		opt_posix.h
 _KPOSIX_PRIORITY_SCHEDULING	opt_posix.h