diff --git a/src/runtime/os_plan9.go b/src/runtime/os_plan9.go
index 6ff15c2236..a0ad9060c5 100644
--- a/src/runtime/os_plan9.go
+++ b/src/runtime/os_plan9.go
@@ -358,15 +358,13 @@ func crash() {
 	*(*int)(nil) = 0
 }
 
+// Don't read from /dev/random, since this device can only
+// return a few hundred bits a second and would slow creation
+// of Go processes down significantly.
+//
 //go:nosplit
 func readRandom(r []byte) int {
-	fd := open(&randomDev[0], _OREAD|_OCEXEC, 0)
-	if fd < 0 {
-		fatal("cannot open /dev/random")
-	}
-	n := int(read(fd, unsafe.Pointer(&r[0]), int32(len(r))))
-	closefd(fd)
-	return n
+	return 0
 }
 
 func initsig(preinit bool) {