diff --git a/chapter-12/src/main/java/org/lwjglb/engine/graph/SceneRender.java b/chapter-12/src/main/java/org/lwjglb/engine/graph/SceneRender.java
index baa2e68..061e888 100644
--- a/chapter-12/src/main/java/org/lwjglb/engine/graph/SceneRender.java
+++ b/chapter-12/src/main/java/org/lwjglb/engine/graph/SceneRender.java
@@ -189,7 +189,7 @@ private void updateSpotLight(SpotLight spotLight, String prefix, Matrix4f viewMa
         }
 
         uniformsMap.setUniform(prefix + ".conedir", coneDirection);
-        uniformsMap.setUniform(prefix + ".conedir", cutoff);
+        uniformsMap.setUniform(prefix + ".cutoff", cutoff);
         updatePointLight(pointLight, prefix + ".pl", viewMatrix);
     }
 }
diff --git a/chapter-13/src/main/java/org/lwjglb/engine/graph/SceneRender.java b/chapter-13/src/main/java/org/lwjglb/engine/graph/SceneRender.java
index 853ad03..c6627e9 100644
--- a/chapter-13/src/main/java/org/lwjglb/engine/graph/SceneRender.java
+++ b/chapter-13/src/main/java/org/lwjglb/engine/graph/SceneRender.java
@@ -202,7 +202,7 @@ private void updateSpotLight(SpotLight spotLight, String prefix, Matrix4f viewMa
         }
 
         uniformsMap.setUniform(prefix + ".conedir", coneDirection);
-        uniformsMap.setUniform(prefix + ".conedir", cutoff);
+        uniformsMap.setUniform(prefix + ".cutoff", cutoff);
         updatePointLight(pointLight, prefix + ".pl", viewMatrix);
     }
 }