diff --git a/internal/graphicscommand/command.go b/internal/graphicscommand/command.go
index 9df0439fa..b673bc7e2 100644
--- a/internal/graphicscommand/command.go
+++ b/internal/graphicscommand/command.go
@@ -192,7 +192,8 @@ func (q *commandQueue) Flush() {
 		const dstAdjustmentFactor = 1.0 / 256.0
 		const texelAdjustmentFactor = 1.0 / 512.0
 
-		for i := 0; i < q.nvertices/graphics.VertexFloatNum; i++ {
+		n := q.nvertices / graphics.VertexFloatNum
+		for i := 0; i < n; i++ {
 			s := q.srcSizes[i]
 
 			// Convert pixels to texels.
diff --git a/internal/shareable/image.go b/internal/shareable/image.go
index 61d4c4591..bffbe190e 100644
--- a/internal/shareable/image.go
+++ b/internal/shareable/image.go
@@ -303,7 +303,8 @@ func (i *Image) DrawTriangles(img *Image, vertices []float32, indices []uint16,
 
 	ox, oy, _, _ := img.region()
 	oxf, oyf := float32(ox), float32(oy)
-	for i := 0; i < len(vertices)/graphics.VertexFloatNum; i++ {
+	n := len(vertices) / graphics.VertexFloatNum
+	for i := 0; i < n; i++ {
 		vertices[i*graphics.VertexFloatNum+2] += oxf
 		vertices[i*graphics.VertexFloatNum+3] += oyf
 		vertices[i*graphics.VertexFloatNum+4] += oxf