diff --git a/ghc/rts/MBlock.c b/ghc/rts/MBlock.c
index 249493a94eb258db3731f60c0fc9ec8aa3ce3d9c..ddf8fd1dbb0c12f5862183ef31ab99d2b23958c9 100644
--- a/ghc/rts/MBlock.c
+++ b/ghc/rts/MBlock.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: MBlock.c,v 1.5 1999/01/18 09:20:08 sof Exp $
+ * $Id: MBlock.c,v 1.6 1999/01/18 10:54:15 simonm Exp $
  *
  * MegaBlock Allocator Interface.  This file contains all the dirty
  * architecture-dependent hackery required to get a chunk of aligned
@@ -52,6 +52,9 @@
 /* guess */
 #define ASK_FOR_MEM_AT 0x50000000
 
+#elif _WIN32
+/* doesn't matter, we use a reserve/commit algorithm */
+
 #else
 #error Dont know where to get memory from on this architecture
 /* ToDo: memory locations on other architectures */