diff --git a/src/mathed/InsetMathColor.cpp b/src/mathed/InsetMathColor.cpp
index 6cb996013b..d665734b51 100644
--- a/src/mathed/InsetMathColor.cpp
+++ b/src/mathed/InsetMathColor.cpp
@@ -29,14 +29,14 @@ using namespace lyx::support;
 namespace lyx {
 
 InsetMathColor::InsetMathColor(Buffer * buf, bool oldstyle, ColorCode color)
-	: InsetMathNest(buf, 1), w_(0), oldstyle_(oldstyle),
+	: InsetMathNest(buf, 1), oldstyle_(oldstyle),
 	  color_(from_utf8(lcolor.getLaTeXName(color)))
 {}
 
 
 InsetMathColor::InsetMathColor(Buffer * buf, bool oldstyle,
 		docstring const & color)
-	: InsetMathNest(buf, 1), w_(0), oldstyle_(oldstyle), color_(color)
+	: InsetMathNest(buf, 1), oldstyle_(oldstyle), color_(color)
 {}
 
 
diff --git a/src/mathed/InsetMathColor.h b/src/mathed/InsetMathColor.h
index 829c4654f4..08495b364d 100644
--- a/src/mathed/InsetMathColor.h
+++ b/src/mathed/InsetMathColor.h
@@ -49,8 +49,6 @@ public:
 	InsetCode lyxCode() const { return MATH_COLOR_CODE; }
 private:
 	virtual Inset * clone() const;
-	/// width of '[' in current font
-	mutable int w_;
 	///
 	bool oldstyle_;
 	/// Our color. Only valid LaTeX colors are allowed.