diff --git a/include/valijson/internal/custom_allocator.hpp b/include/valijson/internal/custom_allocator.hpp
index 07e1d61..e6283e2 100644
--- a/include/valijson/internal/custom_allocator.hpp
+++ b/include/valijson/internal/custom_allocator.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <limits>
+
 namespace valijson {
 namespace internal {