diff -Nru /n/sources/plan9/sys/src/cmd/fossil/9p.c /sys/src/cmd/fossil/9p.c
--- /n/sources/plan9/sys/src/cmd/fossil/9p.c	Thu Jul 29 16:04:16 2010
+++ /sys/src/cmd/fossil/9p.c	Sat Dec  3 00:00:00 2011
@@ -172,18 +172,22 @@
 		}
 		tsync = 0;
 	}
+	op = 0;
 	if(dir.muid != nil && *dir.muid != '\0'){
 		if((uid = uidByUname(dir.muid)) == nil){
 			werrstr("wstat -- unknown muid");
 			goto error;
 		}
 		if(strcmp(uid, de.mid) != 0){
-			werrstr("wstat -- attempt to change muid");
-			goto error;
+			vtfree(de.mid);
+			de.mid = uid;
+			uid = nil;
+			op = 1;
+		}else{
+			vtfree(uid);
+			uid = nil;
+			tsync = 0;
 		}
-		vtfree(uid);
-		uid = nil;
-		tsync = 0;
 	}
 
 	/*
@@ -196,8 +200,6 @@
 		}
 	}
 
-	op = 0;
-
 	oldmode = de.mode;
 	if(dir.qid.type != (uchar)~0 || dir.mode != ~0){
 		/*
diff -Nru /n/sources/plan9/sys/src/cmd/fossil/file.c /sys/src/cmd/fossil/file.c
--- /n/sources/plan9/sys/src/cmd/fossil/file.c	Thu Jun 16 19:35:54 2011
+++ /sys/src/cmd/fossil/file.c	Sat Dec  3 00:00:00 2011
@@ -881,6 +881,11 @@
 		f->dir.gid = vtStrDup(dir->gid);
 	}
 
+	if(strcmp(f->dir.mid, dir->mid) != 0){
+		vtfree(f->dir.mid);
+		f->dir.mid = vtstrdup(dir->mid);
+	}
+
 	f->dir.mtime = dir->mtime;
 	f->dir.atime = dir->atime;