diff --git a/ptbposter/ptbposter-new-engines.clo b/ptbposter/ptbposter-new-engines.clo
index 2a9f517d7a485612641354426357a7479ffc8c39..e31eb158c7c424b7a8adca57959121109efc7ddf 100644
--- a/ptbposter/ptbposter-new-engines.clo
+++ b/ptbposter/ptbposter-new-engines.clo
@@ -29,7 +29,6 @@
     BoldFont=*-bold,
     ItalicFont=*-italic,
     BoldItalicFont=*-bolditalic]
-  \renewcommand*\familydefault{\sfdefault}% ???
 \fi
 \ifMATHSERIF 
   \RequirePackage{unicode-math}
@@ -41,14 +40,11 @@
   %%%\RequirePackage[usefilenames,weight=Regular]{firamath-otf}
   %%%\setoperatorfont\mathsf 
   %%%\unimathsetup{partial=upright}%
-  %%%%%%\RequirePackage{arevmath} 
-  %%%%%%\SetSymbolFont{largesymbols}{normal}{OMX}{iwona}{m}{n} 
-  %%%%%%%%%%%%\RequirePackage[onlysansmath]{mdsymbol}
-  \renewcommand*\familydefault{\sfdefault}%
-  %\RequirePackage{unicode-math}
   \RequirePackage{newtxsf}
 \fi
 
+\renewcommand*\familydefault{\sfdefault}%
+
 \setmonofont{AnonymousPro-Regular}[%
   Extension = .ttf,
   BoldFont = AnonymousPro-Bold,