diff --git a/arch/powerpc/lib/bootm.c b/arch/powerpc/lib/bootm.c
index 6e2a81b..02e544f 100644
--- a/arch/powerpc/lib/bootm.c
+++ b/arch/powerpc/lib/bootm.c
@@ -96,7 +96,7 @@
 		debug ("   Booting using OF flat tree...\n");
 		WATCHDOG_RESET ();
 		(*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
-			   CONFIG_SYS_BOOTMAPSZ, 0, 0);
+			   getenv_bootm_mapsize(), 0, 0);
 		/* does not return */
 	} else
 #endif