diff --git a/AlphaFilter/AlphaFilter.hpp b/AlphaFilter/AlphaFilter.hpp
index 89415aa693..507fffb905 100644
--- a/AlphaFilter/AlphaFilter.hpp
+++ b/AlphaFilter/AlphaFilter.hpp
@@ -42,6 +42,8 @@
 
 #pragma once
 
+#include <float.h>
+
 template <typename T>
 class AlphaFilter {
 public: