--- src/Merging.cc	2020-09-01 19:38:07.000000000 +0800
+++ src/Merging.cc	2025-04-11 03:58:07.000000000 +0800
@@ -7,6 +7,7 @@
 // Function definitions (not found in the header) for the Merging class.
 
 #include "Pythia8/Merging.h"
+#include <limits>
 
 namespace Pythia8 {