diff --git a/data/shader/phong.fsh b/data/shader/phong.fsh
index 7562e38..fe25761 100644
--- a/data/shader/phong.fsh
+++ b/data/shader/phong.fsh
@@ -132,8 +132,8 @@ float samplePointShadow(samplerCubeShadow shadowMap, vec3 lightDirection) {
     float A = -(farPlane+nearPlane)/(farPlane-nearPlane);
     float B = -2*(farPlane*nearPlane)/(farPlane - nearPlane);
     float compValue = 0.5*(-A*length(lightDirection) + B)/length(lightDirection) + 0.5;
-    float bias = 0.001*tan(acos(clamp(dot(vNormal, -directionalLightVector), 0.0, 1.0)));
-    bias = clamp(bias, 0.0, 0.01);
+    float bias = 0.001*tan(acos(clamp(dot(vNormal, lightDirection), 0.0, 1.0)));
+    bias = clamp(bias, 0.0, 0.001);
     return texture(shadowMap, vec4(lightDirection , compValue - bias));
 }