diff --git a/board/boundary/nitrogen6x/nitrogen6x.c b/board/boundary/nitrogen6x/nitrogen6x.c
index 0dbb6d2..229c237 100644
--- a/board/boundary/nitrogen6x/nitrogen6x.c
+++ b/board/boundary/nitrogen6x/nitrogen6x.c
@@ -86,7 +86,7 @@
 
 int dram_init(void)
 {
-	gd->ram_size = CONFIG_DDR_MB * 1024 * 1024;
+	gd->ram_size = ((ulong)CONFIG_DDR_MB * 1024 * 1024);
 
 	return 0;
 }