diff --git a/mps/src/sos9sc.gmk b/mps/src/sos9sc.gmk
index 59399f7db79..6aa6b72bdee 100644
--- a/mps/src/sos9sc.gmk
+++ b/mps/src/sos9sc.gmk
@@ -1,7 +1,7 @@
 #
 #     BUILD FOR Solaris/SPARC v9/SunPro C PLATFORM
 #
-#  $HopeName: MMsrc!sos9sc.gmk(trunk.17) $
+#  $HopeName: MMsrc!sos9sc.gmk(trunk.18) $
 #
 #  This is the GNU makefile for platform.sos9sc
 #
@@ -11,7 +11,7 @@ PFM = sos9sc
 MPM = assert.c ring.c mpsliban.c mpm.c bt.c \
       arenavm.c arenacl.c arena.c pool.c poolmfs.c \
       poolmv.c root.c format.c buffer.c lockan.c ref.c \
-      trace.c than.c protso.c shield.c mpsi.c ld.c vmso.c \
+      trace.c than.c protso.c prmcan.c shield.c mpsi.c ld.c vmso.c \
       mpsioan.c event.c action.c seg.c poolmrg.c message.c \
       span.c
 MPMS = sssos8.s # s9 is backward-compatible with s8 here