diff --git a/algo/base/Options.cxx b/algo/base/Options.cxx
index cecf5b9de779bbc1f3ae3eefc4a04b2465d2bc78..ff74e0e5592075490bfa67d7ce80f9bb3ae99b41 100644
--- a/algo/base/Options.cxx
+++ b/algo/base/Options.cxx
@@ -6,6 +6,7 @@
 #include <boost/program_options.hpp>
 
 #include <iostream>
+#include <unordered_map>
 
 using namespace cbm::algo;
 
diff --git a/algo/evselector/DigiEventSelector.cxx b/algo/evselector/DigiEventSelector.cxx
index c2f5a67b60d56508193e7f49a4ea06a93715f6dc..8eb4a8e1c225f1b0798db9283c1f4d34b5f4b316 100644
--- a/algo/evselector/DigiEventSelector.cxx
+++ b/algo/evselector/DigiEventSelector.cxx
@@ -10,6 +10,7 @@
 
 #include <iterator>
 #include <map>
+#include <unordered_map>
 #include <unordered_set>
 
 #include "AlgoFairloggerCompat.h"