diff --git a/ptbposter/ptbposter-new-engines.clo b/ptbposter/ptbposter-new-engines.clo
index 439c6b86822ffc66c4e1c80871d8a6a2c947049b..7f814fa392ec9c3d94f4727e2c7ec7eda09d4640 100644
--- a/ptbposter/ptbposter-new-engines.clo
+++ b/ptbposter/ptbposter-new-engines.clo
@@ -1,7 +1,7 @@
 % Rolf Niepraschk, Rolf.Niepraschk@ptb.de
 
 \ProvidesFile{ptbposter-new-engines.clo}%
-  [2019/06/27 v0.1d `PTB-Poster' new engines (RN/PTB)]
+  [2019/07/08 v0.1e `PTB-Poster' new engines (RN/PTB)]
   
 \RequirePackage{unicode-math}
 \setmainfont{texgyrepagella}[
@@ -33,6 +33,7 @@
 \ifPTB@serif\else
   \RequirePackage[usefilenames,weight=Regular]{firamath-otf}
   \setmathfont[range=it]{texgyreheros-italic.otf}
+  \setoperatorfont\mathsf
   \renewcommand*\familydefault{\sfdefault}
 \fi