diff --git a/src/demangle/ItaniumDemangle.h b/src/demangle/ItaniumDemangle.h
--- a/src/demangle/ItaniumDemangle.h
+++ b/src/demangle/ItaniumDemangle.h
@@ -27,6 +27,7 @@
 #include <cstring>
 #include <limits>
 #include <new>
+#include <type_traits>
 #include <utility>
 
 DEMANGLE_NAMESPACE_BEGIN