diff --git a/arch/arm/mach-omap/xload.c b/arch/arm/mach-omap/xload.c
index 4a0714e..a013717 100644
--- a/arch/arm/mach-omap/xload.c
+++ b/arch/arm/mach-omap/xload.c
@@ -293,6 +293,7 @@
 			func = omap4_xload_boot_usb();
 		} else {
 			printf("booting from USB not enabled\n");
+			func = NULL;
 		}
 		break;
 	case BOOTSOURCE_NAND: