--- /sys/src/9k/port/page.c
+++ /sys/src/9k/port/page.c
@@ -257,7 +257,7 @@ newpage(int clear, Segment *s, uintptr va, int locked)
 
 	if(clear) {
 		k = kmap(p);
-		memset((void*)VA(k), 0, 1<<p->lg2size);
+		memset((void*)VA(k), 0, pagesize(p));
 		kunmap(k);
 	}
 
@@ -427,7 +427,7 @@ copypage(Page *f, Page *t)
 		panic("copypage");
 	ks = kmap(f);
 	kd = kmap(t);
-	memmove((void*)VA(kd), (void*)VA(ks), 1<<t->lg2size);
+	memmove((void*)VA(kd), (void*)VA(ks), pagesize(t));
 	kunmap(ks);
 	kunmap(kd);
 }
--- /sys/src/9k/port/portdat.h
+++ /sys/src/9k/port/portdat.h
@@ -325,6 +325,8 @@ struct Page
 	Page	*hash;			/* Image hash chains */
 };
 
+#define	pagesize(p)	(1<<(p)->lg2size)
+
 struct Image
 {
 	Ref;