diff --git a/cie1931.hpp b/cie1931.hpp
index 01b480c..8e741b2 100644
--- a/cie1931.hpp
+++ b/cie1931.hpp
@@ -33,7 +33,7 @@ class Cie1931
 		}
 		else
 		{
-			result = ipow(((L + 16.0) / 119.0), 3);
+			result = ipow(((L + 16.0) / 116.0), 3);
 		}
 
 		return result;