diff --git a/biology/stacks/files/patch-src_MetaPopInfo.cc b/biology/stacks/files/patch-src_MetaPopInfo.cc
new file mode 100644
index 000000000000..1963ce9397a4
--- /dev/null
+++ b/biology/stacks/files/patch-src_MetaPopInfo.cc
@@ -0,0 +1,11 @@
+--- src/MetaPopInfo.cc.orig	2024-05-28 12:36:52 UTC
++++ src/MetaPopInfo.cc
+@@ -423,7 +423,7 @@ void MetaPopInfo::fill_pop_indexes(map<int, pair<int, 
+ 
+ void MetaPopInfo::fill_pop_indexes(map<int, pair<int, int> >& pop_indexes) const {
+     pop_indexes.clear();
+-    for (size_t i = 0; i < pops_.size(); ++i)
++    for (int i = 0; i < pops_.size(); ++i)
+         pop_indexes.insert( {i, {pops_[i].first_sample, pops_[i].last_sample}} );
+ }
+