diff --git a/libuavcan_drivers/lpc11c24/test_olimex_lpc_p11c24/src/sys/board.cpp b/libuavcan_drivers/lpc11c24/test_olimex_lpc_p11c24/src/sys/board.cpp
index 9f6fee17e0..21b0b2bbcb 100644
--- a/libuavcan_drivers/lpc11c24/test_olimex_lpc_p11c24/src/sys/board.cpp
+++ b/libuavcan_drivers/lpc11c24/test_olimex_lpc_p11c24/src/sys/board.cpp
@@ -9,8 +9,8 @@
 #include <cstring>
 #include <numeric>
 
-#define PDRUNCFGUSEMASK 0x0000ED00
-#define PDRUNCFGMASKTMP 0x000000FF
+static constexpr unsigned long PDRUNCFGUSEMASK = 0x0000ED00U;
+static constexpr unsigned long PDRUNCFGMASKTMP = 0x000000FFU;
 
 const std::uint32_t OscRateIn = 12000000; ///< External crystal
 const std::uint32_t ExtRateIn = 0;