diff --git a/servers/rendering/renderer_rd/shaders/forward_clustered/scene_forward_clustered.glsl b/servers/rendering/renderer_rd/shaders/forward_clustered/scene_forward_clustered.glsl
index 30f7c6fa29..2a5f6350c1 100644
--- a/servers/rendering/renderer_rd/shaders/forward_clustered/scene_forward_clustered.glsl
+++ b/servers/rendering/renderer_rd/shaders/forward_clustered/scene_forward_clustered.glsl
@@ -1079,7 +1079,7 @@ layout(location = 2) out vec2 motion_vector;
 vec4 volumetric_fog_process(vec2 screen_uv, float z) {
 	vec3 fog_pos = vec3(screen_uv, z * implementation_data.volumetric_fog_inv_length);
 	if (fog_pos.z < 0.0) {
-		return vec4(0.0);
+		return vec4(0.0, 0.0, 0.0, 1.0);
 	} else if (fog_pos.z < 1.0) {
 		fog_pos.z = pow(fog_pos.z, implementation_data.volumetric_fog_detail_spread);
 	}