diff --git a/src/lisp/ppc-validate.h b/src/lisp/ppc-validate.h
index 40530f79e68817e3e247941f012a987444d5539e..1959dc8d52ce2479f0c0923f66b41e56bbd76968 100644
--- a/src/lisp/ppc-validate.h
+++ b/src/lisp/ppc-validate.h
@@ -41,11 +41,17 @@
 #define STATIC_SPACE_START  	(0x10000000)
 #define STATIC_SPACE_SIZE   	(0x07ff8000)	/* 128 MB, almost */
 
+#if 0
 #define CONTROL_STACK_START 	(0x30000000)
+#endif
 #define CONTROL_STACK_SIZE  	(0x07ff8000)	/* 128 MB, almost */
+#if 0
 #define CONTROL_STACK_END       (CONTROL_STACK_START + control_stack_size)
+#endif
 
+#if 0
 #define BINDING_STACK_START 	(0x38000000)
+#endif
 #define BINDING_STACK_SIZE  	(0x07ff8000)	/* 128 MB, almost */
 
 #if 0
diff --git a/src/lisp/sparc-validate.h b/src/lisp/sparc-validate.h
index 0a6a6cea1aa6536b6f44bace0484d7b33452beef..e3a88d74453c9acaa62bc45fe5b7c3e40a746f31 100644
--- a/src/lisp/sparc-validate.h
+++ b/src/lisp/sparc-validate.h
@@ -92,15 +92,22 @@
 #define READ_ONLY_SPACE_START	(SpaceStart_TargetReadOnly)
 #define READ_ONLY_SPACE_SIZE	((2*MB_128) - SPARSE_BLOCK_SIZE)	/* 256 MB - 32 KB, 256 MB max */
 
+#if 0
 #define BINDING_STACK_START 	(0x20000000)
+#endif
+
 #define BINDING_STACK_SIZE  	(MB_128 - SPARSE_BLOCK_SIZE)	/* 128 MB - 32 KB, 128 MB max */
 
 #define STATIC_SPACE_START  	(SpaceStart_TargetStatic)
 #define STATIC_SPACE_SIZE   	((2*MB_128) - SPARSE_BLOCK_SIZE)	/* 256 MB - 32 KB, 256 MB max */
 
+#if 0
 #define CONTROL_STACK_START 	(0x38000000)
+#endif
 #define CONTROL_STACK_SIZE  	(MB_128 - SPARSE_BLOCK_SIZE)	/* 128 MB - 32 KB, 128 MB max */
+#if 0
 #define CONTROL_STACK_END       (CONTROL_STACK_START + control_stack_size)
+#endif
 
 #define DYNAMIC_0_SPACE_START	(SpaceStart_TargetDynamic)
 
diff --git a/src/lisp/x86-validate-darwin.h b/src/lisp/x86-validate-darwin.h
index 712a0feb8db1abed28824c9fafa0c33429a62c12..09f139628c070864417ccba0c09fb976951465e0 100644
--- a/src/lisp/x86-validate-darwin.h
+++ b/src/lisp/x86-validate-darwin.h
@@ -18,10 +18,14 @@
 #define STATIC_SPACE_START	(SpaceStart_TargetStatic)
 #define STATIC_SPACE_SIZE	(0x0ffff000)	/* 256MB - 1 page */
 
+#if 0
 #define BINDING_STACK_START	(0x38000000)
+#endif
 #define BINDING_STACK_SIZE	(0x07fff000)	/* 128MB - 1 page */
 
+#if 0
 #define CONTROL_STACK_START	(0x40000000)
+#endif
 
 /*
  * According to /usr/include/sys/signal.h, MINSIGSTKSZ is 32K and
diff --git a/src/lisp/x86-validate-linux.h b/src/lisp/x86-validate-linux.h
index 258d871870aa451da0de881a62e75082f93086cd..41240c88d51b29ff6fdf400a36638d93c4740125 100644
--- a/src/lisp/x86-validate-linux.h
+++ b/src/lisp/x86-validate-linux.h
@@ -36,10 +36,14 @@
 #define STATIC_SPACE_START	(SpaceStart_TargetStatic)
 #define STATIC_SPACE_SIZE	(0x0ffff000)	/* 256MB - 1 page */
 
+#if 0
 #define BINDING_STACK_START	(0x20000000)
+#endif
 #define BINDING_STACK_SIZE	(0x07fff000)	/* 128MB - 1 page */
 
+#if 0
 #define CONTROL_STACK_START	0x38000000
+#endif
 #define CONTROL_STACK_SIZE	(0x07fff000 - 8192)
 
 #if 0