diff --git a/src/mdebug.cpp b/src/mdebug.cpp
index eb3243b..bc357ca 100644
--- a/src/mdebug.cpp
+++ b/src/mdebug.cpp
@@ -1,3 +1,4 @@
+#include <algorithm>
 #include <unordered_map>
 
 #include "fmt/format.h"