diff --git a/internal/opengl/context.go b/internal/opengl/context.go
index 92d21be0c..1117db7a3 100644
--- a/internal/opengl/context.go
+++ b/internal/opengl/context.go
@@ -19,19 +19,14 @@ import (
 )
 
 var (
-	zeroPlus float32
-	oneMinus float32
-)
-
-func init() {
 	zeroPlus = math.Nextafter32(0, 1)
 	oneMinus = math.Nextafter32(1, 0)
-}
+)
 
 // adjustForClearColor adjust the value x for glClearColor function.
 //
 // On some machines like MacBook Pro, exact 0 and exact 1 might cause problems
-// at glClear() (#452).
+// at glClearColor() (#452).
 func adjustForClearColor(x float32) float32 {
 	if x <= 0 {
 		return zeroPlus