diff --git a/drivers/gles3/rasterizer_scene_gles3.cpp b/drivers/gles3/rasterizer_scene_gles3.cpp
index 6427ec98dc3..2ee439c6c44 100644
--- a/drivers/gles3/rasterizer_scene_gles3.cpp
+++ b/drivers/gles3/rasterizer_scene_gles3.cpp
@@ -933,7 +933,7 @@ void RasterizerSceneGLES3::_update_sky_radiance(RID p_env, const Projection &p_p
 	int max_processing_layer = sky->mipmap_count;
 
 	// Update radiance cubemap
-	if (sky->reflection_dirty && (sky->processing_layer > max_processing_layer || update_single_frame)) {
+	if (sky->reflection_dirty && (sky->processing_layer >= max_processing_layer || update_single_frame)) {
 		static const Vector3 view_normals[6] = {
 			Vector3(+1, 0, 0),
 			Vector3(-1, 0, 0),