diff --git a/sys/src/9/bcm64/mem.h b/sys/src/9/bcm64/mem.h
index 9f454620c..ea2e1a597 100644
--- a/sys/src/9/bcm64/mem.h
+++ b/sys/src/9/bcm64/mem.h
@@ -87,7 +87,7 @@
 
 #define	PTEMAPMEM	(1024*1024)
 #define	PTEPERTAB	(PTEMAPMEM/BY2PG)
-#define	SEGMAPSIZE	1984
+#define	SEGMAPSIZE	8192
 #define	SSEGMAPSIZE	16
 #define	PPN(x)		((x)&~(BY2PG-1))