diff --git a/rtengine/color.cc b/rtengine/color.cc
index a07285ec5..b84c76132 100644
--- a/rtengine/color.cc
+++ b/rtengine/color.cc
@@ -29,6 +29,7 @@ namespace rtengine {
 
     extern const Settings* settings;
 	
+    cmsToneCurve* Color::linearGammaTRC;
     LUTf Color::cachef;
     LUTf Color::gamma2curve;
 
diff --git a/rtengine/stdimagesource.cc b/rtengine/stdimagesource.cc
index 607ffc99a..2ca85eae7 100755
--- a/rtengine/stdimagesource.cc
+++ b/rtengine/stdimagesource.cc
@@ -27,7 +27,6 @@
 
 namespace rtengine {
 
-extern cmsToneCurve* Color::linearGammaTRC;
 extern const Settings* settings;
 
 template<class T> void freeArray (T** a, int H) {