diff --git a/mps/src/sos8gc.gmk b/mps/src/sos8gc.gmk
index 59110dbd2d2..a60e43d7f4a 100644
--- a/mps/src/sos8gc.gmk
+++ b/mps/src/sos8gc.gmk
@@ -1,7 +1,7 @@
 #
 #     BUILD FOR SOLARIS/SPARC v8/GCC PLATFORM
 #
-#  $HopeName: MMsrc!sos8gc.gmk(trunk.20) $
+#  $HopeName: MMsrc!sos8gc.gmk(trunk.21) $
 #  Copyright (C) 1995,1997 Harlequin Group, all rights reserved
 #
 #  This is the GNU makefile for platform.sos8gc.
@@ -13,7 +13,8 @@ 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 \
-      mpsioan.c event.c action.c seg.c message.c poolmrg.c
+      mpsioan.c event.c action.c seg.c message.c poolmrg.c \
+      span.c
 MPMS = sssos8.s
 AMC = amc.c
 AMS = poolams.c