diff --git a/example/blocks/main.go b/example/blocks/main.go
index 13b8f7cee..048ae7353 100644
--- a/example/blocks/main.go
+++ b/example/blocks/main.go
@@ -20,14 +20,9 @@ import (
 	"github.com/hajimehoshi/ebiten/example/blocks/blocks"
 	"log"
 	"os"
-	"runtime"
 	"runtime/pprof"
 )
 
-func init() {
-	runtime.LockOSThread()
-}
-
 var cpuProfile = flag.String("cpuprofile", "", "write cpu profile to file")
 
 func main() {