diff --git a/include/asm-ppc/global_data.h b/include/asm-ppc/global_data.h
index 8cf7b6f..c5ac658 100644
--- a/include/asm-ppc/global_data.h
+++ b/include/asm-ppc/global_data.h
@@ -116,7 +116,7 @@
 	unsigned long   pev_clk;
 	unsigned long   flb_clk;
 #endif
-	unsigned long	ram_size;	/* RAM size */
+	phys_size_t	ram_size;	/* RAM size */
 	unsigned long	reloc_off;	/* Relocation Offset */
 	unsigned long	reset_status;	/* reset status register at boot	*/
 	unsigned long	env_addr;	/* Address  of Environment struct	*/