diff --git a/MMCore/CoreCallback.cpp b/MMCore/CoreCallback.cpp
index 471313c24..7cd1b0e5c 100644
--- a/MMCore/CoreCallback.cpp
+++ b/MMCore/CoreCallback.cpp
@@ -36,6 +36,7 @@
 #include <chrono>
 #include <string>
 #include <vector>
+#include <algorithm>
 
 
 CoreCallback::CoreCallback(CMMCore* c) :