diff --git a/internal/atlas/export_test.go b/internal/atlas/export_test.go
index b20e2e1f2..dc7529963 100644
--- a/internal/atlas/export_test.go
+++ b/internal/atlas/export_test.go
@@ -61,4 +61,4 @@ func (i *Image) EnsureIsolatedForTesting() {
 
 var FlushDeferredForTesting = flushDeferred
 
-var ToPowerOf2 = toPowerOf2
+var FloorPowerOf2 = floorPowerOf2
diff --git a/internal/atlas/image.go b/internal/atlas/image.go
index 66aebb43d..3f6c07a5c 100644
--- a/internal/atlas/image.go
+++ b/internal/atlas/image.go
@@ -728,7 +728,7 @@ func EndFrame(graphicsDriver graphicsdriver.Graphics) error {
 	return nil
 }
 
-func toPowerOf2(x int) int {
+func floorPowerOf2(x int) int {
 	if x <= 0 {
 		return 0
 	}
@@ -757,7 +757,7 @@ func BeginFrame(graphicsDriver graphicsdriver.Graphics) error {
 			minSize = 1024
 		}
 		if maxSize == 0 {
-			maxSize = toPowerOf2(restorable.MaxImageSize(graphicsDriver))
+			maxSize = floorPowerOf2(restorable.MaxImageSize(graphicsDriver))
 		}
 	})
 	if err != nil {
diff --git a/internal/atlas/image_test.go b/internal/atlas/image_test.go
index 5aa0b5c1d..b5e6ca3e1 100644
--- a/internal/atlas/image_test.go
+++ b/internal/atlas/image_test.go
@@ -776,10 +776,10 @@ func TestPowerOf2(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		got := atlas.ToPowerOf2(tc.In)
+		got := atlas.FloorPowerOf2(tc.In)
 		want := tc.Out
 		if got != want {
-			t.Errorf("packing.ToPowerOf2(%d): got: %d, want: %d", tc.In, got, want)
+			t.Errorf("packing.FloorPowerOf2(%d): got: %d, want: %d", tc.In, got, want)
 		}
 	}
 }