--- ./src/lib/libast/misc/stk.c.orig	2014-11-26 16:01:29.606716557 +0000
+++ ./src/lib/libast/misc/stk.c	2014-11-26 16:03:06.031328609 +0000
@@ -505,7 +505,7 @@ static char *stkgrow(register Sfio_t *st
 	register char *cp, *dp=0;
 	register size_t m = stktell(stream);
 	size_t endoff;
-	char *end=0;
+	char *end=0, *oldbase=0;
 	int nn=0,add=1;
 	n += (m + sizeof(struct frame)+1);
 	if(sp->stkflags&STK_SMALL)
@@ -521,6 +521,7 @@ static char *stkgrow(register Sfio_t *st
 		dp=sp->stkbase;
 		sp->stkbase = ((struct frame*)dp)->prev;
 		end = fp->end;
+		oldbase = dp;
 	}
 	endoff = end - dp;
 	cp = newof(dp, char, n, nn*sizeof(char*));
@@ -547,10 +548,10 @@ static char *stkgrow(register Sfio_t *st
 	if(fp->nalias=nn)
 	{
 		fp->aliases = (char**)fp->end;
-		if(end && nn>1)
-			memmove(fp->aliases,end,(nn-1)*sizeof(char*));
+		if(end && nn>add)
+			memmove(fp->aliases,end,(nn-add)*sizeof(char*));
 		if(add)
-			fp->aliases[nn-1] = dp + roundof(sizeof(struct frame),STK_ALIGN);
+			fp->aliases[nn-1] = oldbase + roundof(sizeof(struct frame),STK_ALIGN);
 	}
 	if(m && !dp)
 	{