diff --git a/services/std_svc/psci/psci_afflvl_off.c b/services/std_svc/psci/psci_afflvl_off.c
index e007bc3..21a4d1a 100644
--- a/services/std_svc/psci/psci_afflvl_off.c
+++ b/services/std_svc/psci/psci_afflvl_off.c
@@ -82,6 +82,7 @@
 	sctlr = read_sctlr_el3();
 	sctlr &= ~SCTLR_C_BIT;
 	write_sctlr_el3(sctlr);
+	isb();	/* ensure MMU disable takes immediate effect */
 
 	/*
 	 * CAUTION: This flush to the level of unification makes an assumption