diff --git a/src/core/include/mp-units/bits/text_tools.h b/src/core/include/mp-units/bits/text_tools.h
index 4c61b7e5..32931e08 100644
--- a/src/core/include/mp-units/bits/text_tools.h
+++ b/src/core/include/mp-units/bits/text_tools.h
@@ -23,6 +23,7 @@
 #pragma once
 
 #include <mp-units/bits/external/fixed_string.h>
+#include <mp-units/bits/external/type_traits.h>
 #include <mp-units/bits/ratio.h>
 #include <mp-units/bits/symbol_text.h>