diff --git a/ptbposter/ptbposter-new-engines.clo b/ptbposter/ptbposter-new-engines.clo
index 06a67e1ed516739884109c872b7617c2b5cf72c6..ac8413d51bf57529540c0c67aefc61ba19ce76f4 100644
--- a/ptbposter/ptbposter-new-engines.clo
+++ b/ptbposter/ptbposter-new-engines.clo
@@ -1,9 +1,8 @@
 % Rolf Niepraschk, Rolf.Niepraschk@ptb.de
 
 \ProvidesFile{ptbposter-new-engines.clo}%
-  [2019/06/18 v0.1b `PTB-Poster' new engines (RN/PTB)]
+  [2019/06/25 v0.1c `PTB-Poster' new engines (RN/PTB)]
   
-\RequirePackage[no-math]{fontspec}
 \RequirePackage{unicode-math}
 \setmainfont{texgyrepagella}[
   Ligatures=TeX,
@@ -26,12 +25,11 @@
   BoldItalicFont = AnonymousPro-BoldItalic,
   Scale     = MatchLowercase
 ]
-\ifPTB@serif
-  \setmathfont{texgyrepagella-math.otf}[math-style=ISO,bold-style=ISO]
-\else
-  \renewcommand*\familydefault{\sfdefault} 
+\setmathfont{texgyrepagella-math.otf}[math-style=ISO,bold-style=ISO]
+\ifPTB@serif\else
+  \renewcommand*\familydefault{\sfdefault}
+  \setmathfont[range=it]{texgyreheros-italic.otf} 
   \RequirePackage[usefilenames,weight=Regular]{firamath-otf}
-  \setmathfont[range=it]{texgyreheros-italic.otf}  
 \fi
 \RequirePackage{newunicodechar}
 \newunicodechar{^^^^202f}{\,}% 'NARROW NO-BREAK SPACE' (\u202F, 8239)