diff --git a/TNC/Correlator.h b/TNC/Correlator.h
index 3fca7ea..7aa0257 100644
--- a/TNC/Correlator.h
+++ b/TNC/Correlator.h
@@ -11,6 +11,7 @@
 #include <array>
 #include <cstdint>
 #include <cstddef>
+#include <limits>
 #include <type_traits>
 #include <tuple>