diff --git a/src/mathed/InsetMathDiagram.h b/src/mathed/InsetMathDiagram.h
index 7ab099cec3..62b0efdea7 100644
--- a/src/mathed/InsetMathDiagram.h
+++ b/src/mathed/InsetMathDiagram.h
@@ -33,8 +33,6 @@ public:
 	///
 	virtual int rowsep() const;
 
-	///
-	void normalize();
 	///
 	void write(WriteStream & os) const;
 	///
diff --git a/src/mathed/InsetMathXYArrow.h b/src/mathed/InsetMathXYArrow.h
index 3ac717ea97..da5d0a68c9 100644
--- a/src/mathed/InsetMathXYArrow.h
+++ b/src/mathed/InsetMathXYArrow.h
@@ -36,8 +36,6 @@ public:
 	///
 	InsetMathXYArrow * asXYArrowInset() { return this; }
 
-	///
-	void normalize();
 	///
 	void write(WriteStream & os) const;
 	///
diff --git a/src/mathed/InsetMathXYMatrix.h b/src/mathed/InsetMathXYMatrix.h
index eb4c7a3236..72f48efe46 100644
--- a/src/mathed/InsetMathXYMatrix.h
+++ b/src/mathed/InsetMathXYMatrix.h
@@ -33,8 +33,6 @@ public:
 	///
 	virtual int rowsep() const;
 
-	///
-	void normalize();
 	///
 	void write(WriteStream & os) const;
 	///