diff --git a/mps/src/poolamc.c b/mps/src/poolamc.c
index b5e976f784a..b3918fe0064 100644
--- a/mps/src/poolamc.c
+++ b/mps/src/poolamc.c
@@ -1,6 +1,6 @@
 /* impl.c.poolamc: AUTOMATIC MOSTLY-COPYING MEMORY POOL CLASS
  *
- * $HopeName: MMsrc!poolamc.c(trunk.49) $
+ * $HopeName: MMsrc!poolamc.c(trunk.50) $
  * Copyright (C) 2000 Harlequin Limited.  All rights reserved.
  *
  * .sources: design.mps.poolamc.
@@ -9,7 +9,7 @@
 #include "mpscamc.h"
 #include "mpm.h"
 
-SRCID(poolamc, "$HopeName: MMsrc!poolamc.c(trunk.49) $");
+SRCID(poolamc, "$HopeName: MMsrc!poolamc.c(trunk.50) $");
 
 
 /* PType enumeration -- distinguishes AMCGen and AMCNailBoard */
@@ -56,7 +56,7 @@ typedef struct AMCGenStruct {
 
 #define AMCRampGen (TraceTopGen+1)
 
-enum { outsideRamp, beginRamp, ramping, finishRamp, collectingRamp };
+enum {outsideRamp = 1, beginRamp, ramping, finishRamp, collectingRamp};
 
 
 /* AMCNailBoard -- the nail board */