--- /n/sources/plan9/sys/src/cmd/history.c	Fri Sep 25 19:30:03 2009
+++ /sys/src/cmd/history.c	Sat Jun 29 08:24:24 2013
@@ -199,7 +199,8 @@
 			case 0:
 				dargv[ndargv] = pair[toggle];
 				dargv[ndargv+1] = pair[toggle ^ 1];
-				exec("/bin/diff", dargv);
+				dargv[ndargv+2] = "-Nru";
+				exec("/bin/ape/diff", dargv);
 				fprint(2, "can't exec diff: %r\n");
 				exits(0);
 			case -1: