diff --git a/src/mathed/InsetMathSpace.cpp b/src/mathed/InsetMathSpace.cpp
index bd426008cd..985e93f127 100644
--- a/src/mathed/InsetMathSpace.cpp
+++ b/src/mathed/InsetMathSpace.cpp
@@ -207,6 +207,40 @@ void InsetMathSpace::mathmlize(MathStream & ms) const
 }
 
 	
+void InsetMathSpace::htmlize(HtmlStream & ms) const
+{
+	SpaceInfo const & si = space_info[space_];
+	switch (si.kind) {
+	case InsetSpaceParams::THIN:
+		ms << from_ascii("&thinsp;");
+		break;
+	case InsetSpaceParams::MEDIUM:
+		ms << from_ascii("&nbsp;");
+		break;
+	case InsetSpaceParams::THICK:
+		ms << from_ascii("&emsp;");
+		break;
+	case InsetSpaceParams::ENSKIP:
+		ms << from_ascii("&ensp;");
+		break;
+	case InsetSpaceParams::QUAD:
+		ms << from_ascii("&emsp;");
+		break;
+	case InsetSpaceParams::QQUAD:
+		ms << from_ascii("&emsp;&emsp;");
+		break;
+	case InsetSpaceParams::CUSTOM: {
+		string l = length_.asHTMLString();
+		ms << MTag("span", "width='" + l + "'") 
+		   << from_ascii("&nbsp;") << ETag("span");
+		break;
+	}
+	default:
+		break;
+	}
+}
+
+	
 void InsetMathSpace::normalize(NormalStream & os) const
 {
 	os << "[space " << int(space_) << "] ";
diff --git a/src/mathed/InsetMathSpace.h b/src/mathed/InsetMathSpace.h
index 381562178c..8f633fffa8 100644
--- a/src/mathed/InsetMathSpace.h
+++ b/src/mathed/InsetMathSpace.h
@@ -53,6 +53,8 @@ public:
 	///
 	void mathmlize(MathStream & ms) const;
 	///
+	void htmlize(HtmlStream & ms) const;
+	///
 	void write(WriteStream & os) const;
 	/// generate something that will be understood by the Dialogs.
 	InsetSpaceParams params() const;