diff --git a/src/branch_tier.cpp b/src/branch_tier.cpp
index f5f36b6a..241aebb5 100644
--- a/src/branch_tier.cpp
+++ b/src/branch_tier.cpp
@@ -3,6 +3,7 @@
 #include "fmt/core.h"
 
 #include "fs_glob.hpp"
+#include <cassert>
 
 
 namespace l