diff --git a/data/shaders/light-refract.frag b/data/shaders/light-refract.frag
index cc04071..1dcd751 100644
--- a/data/shaders/light-refract.frag
+++ b/data/shaders/light-refract.frag
@@ -23,7 +23,7 @@
     vec2 normcoord = (MapCoord.st + front_refraction.st + point_five) * point_five;
     vec4 back_normal = texture2D(NormalMap, normcoord);
     // Now refract again, using the minus normal from the lookup.
-    vec3 back_refraction = refract(front_refraction, -back_normal.xyz, 1.5);
+    vec3 back_refraction = refract(front_refraction, back_normal.xyz, 1.5);
     vec2 imagecoord = (normcoord + back_refraction.st + point_five) * point_five;
     vec4 texel = texture2D(ImageMap, imagecoord);
     // Add in a specular component