Missing include

diff --git a/src/kernel/actor/SimcallObserver.hpp b/src/kernel/actor/SimcallObserver.hpp
index cfc60a1..5032f38 100644 (file)
--- a/src/kernel/actor/SimcallObserver.hpp
+++ b/src/kernel/actor/SimcallObserver.hpp
@@ -11,6 +11,7 @@
 #include "xbt/asserts.h"
 
 #include <string>
+#include <unordered_map>
 
 namespace simgrid::kernel::actor {