diff --git a/hal_st/instantiations/NucleoUi.hpp b/hal_st/instantiations/NucleoUi.hpp
index fe4b27fd..ec900620 100644
--- a/hal_st/instantiations/NucleoUi.hpp
+++ b/hal_st/instantiations/NucleoUi.hpp
@@ -36,6 +36,7 @@ namespace main_
 #endif
     };
 
+#if defined(PORTD)
     // UM2435: MB1355 reference board with STM32WB55RG
     struct Nucleo64WBUi
     {
@@ -46,6 +47,7 @@ namespace main_
         hal::GpioPinStm ledGreen{ hal::Port::B, 0 };
         hal::GpioPinStm ledBlue{ hal::Port::B, 5 };
     };
+#endif
 
     // UM3103: MB1863 reference board with STM32WBA52CG
     struct Nucleo64WBAUi