diff --git a/internal/graphics/command.go b/internal/graphics/command.go
index f3facd379..674e7ab48 100644
--- a/internal/graphics/command.go
+++ b/internal/graphics/command.go
@@ -77,8 +77,8 @@ func (q *commandQueue) Flush(context *opengl.Context) error {
 	}
 	// NOTE: WebGL doesn't seem to have Check gl.MAX_ELEMENTS_VERTICES or gl.MAX_ELEMENTS_INDICES so far.
 	// Let's use them to compare to len(quads) in the future.
-	if MaxQuads < len(vertices)/16 {
-		return errors.New(fmt.Sprintf("len(quads) must be equal to or less than %d", MaxQuads))
+	if maxQuads < len(vertices)/16 {
+		return errors.New(fmt.Sprintf("len(quads) must be equal to or less than %d", maxQuads))
 	}
 	numc := len(q.commands)
 	for _, c := range q.commands {
diff --git a/internal/graphics/program.go b/internal/graphics/program.go
index 3f4aae921..5468e2168 100644
--- a/internal/graphics/program.go
+++ b/internal/graphics/program.go
@@ -42,7 +42,7 @@ var (
 
 const (
 	indicesNum = 1 << 16
-	MaxQuads   = indicesNum / 6
+	maxQuads   = indicesNum / 6
 )
 
 // unsafe.SizeOf can't be used because unsafe doesn't work with GopherJS.
@@ -94,10 +94,10 @@ func (s *openGLState) reset(context *opengl.Context) error {
 	}
 
 	const stride = 8 // (2 [vertices] + 2 [texels]) * 2 [sizeof(int16)/bytes]
-	s.arrayBuffer = context.NewBuffer(opengl.ArrayBuffer, 4*stride*MaxQuads, opengl.DynamicDraw)
+	s.arrayBuffer = context.NewBuffer(opengl.ArrayBuffer, 4*stride*maxQuads, opengl.DynamicDraw)
 
-	indices := make([]uint16, 6*MaxQuads)
-	for i := uint16(0); i < MaxQuads; i++ {
+	indices := make([]uint16, 6*maxQuads)
+	for i := uint16(0); i < maxQuads; i++ {
 		indices[6*i+0] = 4*i + 0
 		indices[6*i+1] = 4*i + 1
 		indices[6*i+2] = 4*i + 2