diff --git a/libuavcan/include/uavcan/marshal/array.hpp b/libuavcan/include/uavcan/marshal/array.hpp
index c3384c678a..1d7669fcf3 100644
--- a/libuavcan/include/uavcan/marshal/array.hpp
+++ b/libuavcan/include/uavcan/marshal/array.hpp
@@ -14,6 +14,7 @@
 #include <uavcan/util/compile_time.hpp>
 #include <uavcan/impl_constants.hpp>
 #include <uavcan/marshal/type_util.hpp>
+#include <uavcan/marshal/integer_spec.hpp>
 
 #ifndef UAVCAN_EXCEPTIONS
 # error UAVCAN_EXCEPTIONS