diff --git a/src/DebugLogger.cc b/src/DebugLogger.cc
index 518c698862..a21392f769 100644
--- a/src/DebugLogger.cc
+++ b/src/DebugLogger.cc
@@ -5,6 +5,7 @@
 #include "zeek/DebugLogger.h"
 
 #include <unistd.h>
+#include <algorithm>
 #include <cstdlib>
 
 #include "zeek/RunState.h"