diff --git a/src/runtime/scheduler_cores.go b/src/runtime/scheduler_cores.go
index c2736cafd..878472e45 100644
--- a/src/runtime/scheduler_cores.go
+++ b/src/runtime/scheduler_cores.go
@@ -136,6 +136,7 @@ func sleep(duration int64) {
 // other cores when ready.
 func run() {
 	initHeap()
+	initRand()
 
 	go func() {
 		// Package initializers are currently run single-threaded.
diff --git a/src/runtime/scheduler_threads.go b/src/runtime/scheduler_threads.go
index 6d41d0c99..650a46534 100644
--- a/src/runtime/scheduler_threads.go
+++ b/src/runtime/scheduler_threads.go
@@ -22,6 +22,7 @@ var (
 // can just initialize everything and run main.main on the main thread.
 func run() {
 	initHeap()
+	initRand()
 	task.Init(stackTop)
 	initAll()
 	callMain()