diff --git a/include/Utils/colourConverter.h b/include/Utils/colourConverter.h
index 2a1fb8ebd0765933e5c3a385a384e06f642cc2ca..b4e05084918a5352ed76c960f98103db621ddef0 100644
--- a/include/Utils/colourConverter.h
+++ b/include/Utils/colourConverter.h
@@ -32,6 +32,17 @@ namespace CGoGN {
 
 namespace Utils {
 
+/**
+ * Supported colour spaces
+ */
+enum ColourEncoding
+{
+	C_RGB = 0,
+	C_Luv = 1,
+	C_XYZ = 2,
+	C_Lab = 3
+} ;
+
 /**
  * Class for colour conversions between the enumerated colour spaces.
  * Usage :
@@ -47,10 +58,6 @@ class ColourConverter
 
 public: // types
 	typedef Geom::Vector<3,REAL> VEC3 ;
-	/**
-	 * Supported colour spaces
-	 */
-	enum ColourEncoding { C_RGB, C_XYZ, C_Luv, C_Lab } ;
 
 public: // methods
 	/**
diff --git a/include/Utils/colourConverter.hpp b/include/Utils/colourConverter.hpp
index 5106baf9f093890419081e5d135ebb4daef7b00e..502245a7b522a426f915f2b3c018570d5f28aa0f 100644
--- a/include/Utils/colourConverter.hpp
+++ b/include/Utils/colourConverter.hpp
@@ -181,7 +181,7 @@ void ColourConverter<REAL>::convertLuvToXYZ() {
 	REAL v1 = v/den + vn ;
 	den = 4.0*v1 ;
 	X = Y * 9.0 * u1 / den ;
-	Z = Y * (12 - 3*u1 - 20*v1) / den ;
+	Z = Y * (12.0 - 3.0*u1 - 20.0*v1) / den ;
 
 	XYZ = new VEC3(X,Y,Z) ;
 }