diff --git a/stand/sparc64/loader/main.c b/stand/sparc64/loader/main.c
index ff348fe27eb..c7e880caefe 100644
--- a/stand/sparc64/loader/main.c
+++ b/stand/sparc64/loader/main.c
@@ -77,7 +77,7 @@ __FBSDID("$FreeBSD$");
 
 enum {
 	HEAPVA		= 0x800000,
-	HEAPSZ		= 0x1000000,
+	HEAPSZ		= 0x3000000,
 	LOADSZ		= 0x1000000	/* for kernel and modules */
 };