--- xtp/include/votca/xtp/votca_xtp_config.h.in.orig	2025-10-03 18:44:55 UTC
+++ xtp/include/votca/xtp/votca_xtp_config.h.in
@@ -20,6 +20,9 @@
 #ifndef VOTCA_XTP_CONFIG_H
 #define VOTCA_XTP_CONFIG_H
 
+// Standard includes
+#include <cassert>
+
 /* OpenMP */
 
 #if defined(_OPENMP)
