diff --git a/internal/driver/ui.go b/internal/driver/ui.go
index aadb43da1..499f398b3 100644
--- a/internal/driver/ui.go
+++ b/internal/driver/ui.go
@@ -20,10 +20,6 @@ import (
 	"time"
 )
 
-// IsPlayground indicates whether the current environment is the Go Playground (play.golang.org) or not.
-// The fixed time is explicitly defined. See "About the Playground" at play.golang.org.
-var IsPlayground = time.Now().UnixNano() == 1257894000000000000
-
 type UIContext interface {
 	SetSize(width, height int, scale float64)
 	Update(afterFrameUpdate func()) error