diff --git a/exportfs/exportfs.c b/exportfs/exportfs.c
index 568cdbe..3f64bab 100644
--- a/exportfs/exportfs.c
+++ b/exportfs/exportfs.c
@@ -58,7 +58,7 @@ exportfs(int fd, int msgsz)
 	if(messagesize == 0){
 		messagesize = iounit(netfd);
 		if(messagesize == 0)
-			messagesize = 8192+IOHDRSZ;
+			messagesize = 8*8192+IOHDRSZ;
 	}
 
 	Workq = emallocz(sizeof(Fsrpc)*Nr_workbufs);
diff --git a/exportfs/exportsrv.c b/exportfs/exportsrv.c
index dabb6a0..3f00c87 100644
--- a/exportfs/exportsrv.c
+++ b/exportfs/exportsrv.c
@@ -16,7 +16,7 @@ char Eversion[] = "Bad 9P2000 version";
 
 int iounit(int x)
 {
-	return 8192+IOHDRSZ;
+	return 8*8192+IOHDRSZ;
 }
 
 void*