diff --git a/src/Length.h b/src/Length.h
index bf377d2a83..67073a2bf1 100644
--- a/src/Length.h
+++ b/src/Length.h
@@ -89,7 +89,7 @@ public:
 	std::string const asLatexString() const;
 	/// return the on-screen size of this length
 	int inPixels(int text_width, int em_width = 0) const;
-	/// return the on-screen size of this length of an image
+	/// return the value in Big Postscript points.
 	int inBP() const;
 
 	friend bool isValidLength(std::string const & data, Length * result);
diff --git a/src/mathed/InsetMathGrid.cpp b/src/mathed/InsetMathGrid.cpp
index ade0f4d48d..e303e6e270 100644
--- a/src/mathed/InsetMathGrid.cpp
+++ b/src/mathed/InsetMathGrid.cpp
@@ -25,6 +25,7 @@
 #include "FuncRequest.h"
 
 #include "frontends/Clipboard.h"
+#include "frontends/FontMetrics.h"
 #include "frontends/Painter.h"
 
 #include "support/debug.h"
@@ -80,9 +81,11 @@ InsetMathGrid::RowInfo::RowInfo()
 
 
 
-int InsetMathGrid::RowInfo::skipPixels() const
+int InsetMathGrid::RowInfo::skipPixels(MetricsInfo const & mi) const
 {
-	return crskip_.inBP();
+	frontend::FontMetrics const & fm = theFontMetrics(mi.base.font);
+	return crskip_.inPixels(mi.base.textwidth,
+				fm.width(char_type('M')));
 }
 
 
@@ -367,7 +370,7 @@ void InsetMathGrid::metrics(MetricsInfo & mi, Dimension & dim) const
 		rowinfo_[row].offset_  =
 			rowinfo_[row - 1].offset_  +
 			rowinfo_[row - 1].descent_ +
-			rowinfo_[row - 1].skipPixels() +
+			rowinfo_[row - 1].skipPixels(mi) +
 			rowsep() +
 			rowinfo_[row].lines_ * hlinesep() +
 			rowinfo_[row].ascent_;
@@ -550,7 +553,7 @@ void InsetMathGrid::metricsT(TextMetricsInfo const & mi, Dimension & dim) const
 		rowinfo_[row].offset_  =
 			rowinfo_[row - 1].offset_  +
 			rowinfo_[row - 1].descent_ +
-			//rowinfo_[row - 1].skipPixels() +
+			//rowinfo_[row - 1].skipPixels(mi) +
 			1 + //rowsep() +
 			//rowinfo_[row].lines_ * hlinesep() +
 			rowinfo_[row].ascent_;
diff --git a/src/mathed/InsetMathGrid.h b/src/mathed/InsetMathGrid.h
index 15aa437d8a..91abcae608 100644
--- a/src/mathed/InsetMathGrid.h
+++ b/src/mathed/InsetMathGrid.h
@@ -49,7 +49,7 @@ public:
 		///
 		RowInfo();
 		///
-		int skipPixels() const;
+		int skipPixels(MetricsInfo const & mi) const;
 		/// cached descent
 		mutable int descent_;
 		/// cached ascent