diff --git a/assignment-1b/src/scene/illumination.rs b/assignment-1b/src/scene/illumination.rs
index 8f1786c..250a5eb 100644
--- a/assignment-1b/src/scene/illumination.rs
+++ b/assignment-1b/src/scene/illumination.rs
@@ -61,7 +61,7 @@ impl Scene {
           LightKind::Point { location } => {
             location - intersection_context.point
           }
-          LightKind::Directional { direction } => direction,
+          LightKind::Directional { direction } => -direction,
         }
         .normalize();