--- xtp/include/votca/xtp/qmstate.h.orig	2025-10-03 18:44:55 UTC
+++ xtp/include/votca/xtp/qmstate.h
@@ -23,6 +23,7 @@
 
 // Standard includes
 #include <string>
+#include <cassert>
 
 // VOTCA includes
 #include <votca/tools/types.h>