diff --git a/bin/sh/memalloc.c b/bin/sh/memalloc.c
index 3ee104c4cc4e..bc567d08450e 100644
--- a/bin/sh/memalloc.c
+++ b/bin/sh/memalloc.c
@@ -277,16 +277,6 @@ growstackblock(int min)
 
 
 
-void
-grabstackblock(int len)
-{
-	len = ALIGN(len);
-	stacknxt += len;
-	stacknleft -= len;
-}
-
-
-
 /*
  * The following routines are somewhat easier to use that the above.
  * The user declares a variable of type STACKSTR, which may be declared
diff --git a/bin/sh/memalloc.h b/bin/sh/memalloc.h
index f3e8829eed4f..425004ed3f72 100644
--- a/bin/sh/memalloc.h
+++ b/bin/sh/memalloc.h
@@ -55,7 +55,6 @@ pointer stalloc(int);
 void stunalloc(pointer);
 void setstackmark(struct stackmark *);
 void popstackmark(struct stackmark *);
-void grabstackblock(int);
 char *growstackstr(void);
 char *makestrspace(int, char *);
 char *stputbin(const char *data, int len, char *p);
@@ -65,6 +64,7 @@ char *stputs(const char *data, char *p);
 
 #define stackblock() stacknxt
 #define stackblocksize() stacknleft
+#define grabstackblock(n) stalloc(n)
 #define STARTSTACKSTR(p)	p = stackblock()
 #define STPUTC(c, p)	do { if (p == sstrend) p = growstackstr(); *p++ = (c); } while(0)
 #define CHECKSTRSPACE(n, p)	{ if (sstrend - p < n) p = makestrspace(n, p); }