diff --git a/InstructionSets/Sizes.hpp b/InstructionSets/Sizes.hpp
index f66347ec2..62f95845a 100644
--- a/InstructionSets/Sizes.hpp
+++ b/InstructionSets/Sizes.hpp
@@ -9,6 +9,8 @@
 #ifndef Sizes_h
 #define Sizes_h
 
+#include <limits>
+
 /*!
 	Maps to the smallest of the following integers that can contain max_value: