diff --git a/include/icsneo/device/tree/radpluto/radplutosettings.h b/include/icsneo/device/tree/radpluto/radplutosettings.h
index 3e408ba..037fe83 100644
--- a/include/icsneo/device/tree/radpluto/radplutosettings.h
+++ b/include/icsneo/device/tree/radpluto/radplutosettings.h
@@ -10,7 +10,7 @@ namespace icsneo {
 
 #endif
 
-constexpr size_t PLUTO_MAX_MAC_CONFIG_ENTRIES = 5;
+#define PLUTO_MAX_MAC_CONFIG_ENTRIES (5)
 
 #pragma pack(push, 2)
 typedef struct {