diff --git a/cpu/mpc8xx/cpu_init.c b/cpu/mpc8xx/cpu_init.c
index 4bd91f9..83ff66a 100644
--- a/cpu/mpc8xx/cpu_init.c
+++ b/cpu/mpc8xx/cpu_init.c
@@ -54,9 +54,11 @@
 #endif /* CONFIG_WATCHDOG */
 
 	/* SIUMCR - contains debug pin configuration (11-6) */
-
+#ifndef CONFIG_SVM_SC8xx
 	immr->im_siu_conf.sc_siumcr |= CFG_SIUMCR;
-
+#else
+	immr->im_siu_conf.sc_siumcr = CFG_SIUMCR;
+#endif
 	/* initialize timebase status and control register (11-26) */
 	/* unlock TBSCRK */