diff --git a/scripts/dtc/libfdt/fdt_ro.c b/scripts/dtc/libfdt/fdt_ro.c
index efe7efe921..63eaf57f43 100644
--- a/scripts/dtc/libfdt/fdt_ro.c
+++ b/scripts/dtc/libfdt/fdt_ro.c
@@ -937,4 +937,10 @@ int fdt_check_full(const void *fdt, size_t bufsize)
 		}
 	}
 }
-#endif
+#else
+int fdt_check_full(const void __always_unused *fdt,
+		   size_t __always_unused bufsize)
+{
+	return 0;
+}
+#endif /* #if !defined(FDT_ASSUME_MASK) || FDT_ASSUME_MASK != 0xff */