diff --git a/Src/ROMSet.h b/Src/ROMSet.h
index d4c4441..b6ab048 100644
--- a/Src/ROMSet.h
+++ b/Src/ROMSet.h
@@ -4,6 +4,7 @@
 #include <memory>
 #include <string>
 #include <map>
+#include <algorithm>
 
 // Holds a single ROM region
 struct ROM