diff --git a/pkgs/data/fonts/libertine/2.7.nix b/pkgs/data/fonts/libertine/2.7.nix
index 3210f20d5018..271e128b1298 100644
--- a/pkgs/data/fonts/libertine/2.7.nix
+++ b/pkgs/data/fonts/libertine/2.7.nix
@@ -12,6 +12,9 @@ rec {
   phaseNames = ["doUnpack" "generateFontsFromSFD" "installFonts"];
       
   createTTF=false;
+  extraFontForgeCommands = ''
+    ScaleToEm(1000);
+  '';
 
   name = "linux-libertine-" + version;
   meta = {
diff --git a/pkgs/top-level/builder-defs.nix b/pkgs/top-level/builder-defs.nix
index 8d839c3ba09e..ee7aafbdd25a 100644
--- a/pkgs/top-level/builder-defs.nix
+++ b/pkgs/top-level/builder-defs.nix
@@ -410,8 +410,9 @@ args: with args; with stringsWithDeps; with lib;
    generateFontsFromSFD = noDepEntry(''
    	for i in *.sfd; do
 		${args.fontforge}/bin/fontforge -c \
-			'Open($1); 
-			Reencode("unicode");
+			'Open($1);
+			${optionalString (args ? extraFontForgeCommands) args.extraFontForgeCommands
+			}Reencode("unicode");
 			 ${optionalString (getAttr ["createTTF"] true args) ''Generate($1:r + ".ttf");''}
 			 ${optionalString (getAttr ["createOTF"] true args) ''Generate($1:r + ".otf");''}
 			 Reencode("TeX-Base-Encoding");