diff --git a/src/soc/intel/xeon_sp/cpx/romstage.c b/src/soc/intel/xeon_sp/cpx/romstage.c
index 6f47a30234..e423d0a6d1 100644
--- a/src/soc/intel/xeon_sp/cpx/romstage.c
+++ b/src/soc/intel/xeon_sp/cpx/romstage.c
@@ -163,5 +163,8 @@ void platform_fsp_memory_init_params_cb(FSPM_UPD *mupd, uint32_t version)
 	m_cfg->VtdSupport = config->vtd_support;
 	m_cfg->X2apic = config->x2apic;
 
+	/* Disable ISOC */
+	m_cfg->isocEn = 0;
+
 	mainboard_memory_init_params(mupd);
 }