diff --git a/libuavcan_drivers/lpc11c24/driver/src/c_can.hpp b/libuavcan_drivers/lpc11c24/driver/src/c_can.hpp
index d33bc69e47..4882e65f41 100644
--- a/libuavcan_drivers/lpc11c24/driver/src/c_can.hpp
+++ b/libuavcan_drivers/lpc11c24/driver/src/c_can.hpp
@@ -157,6 +157,11 @@ enum class StatLec : std::uint32_t
     Unused      = 7
 };
 
+/*
+ * IF.CMDREQ
+ */
+static constexpr std::uint32_t IF_CMDREQ_BUSY = 1 << 15;
+
 /*
  * IF.CMDMSK
  */