diff --git a/include/lib/aarch64/arch.h b/include/lib/aarch64/arch.h
index 01eb155..9186094 100644
--- a/include/lib/aarch64/arch.h
+++ b/include/lib/aarch64/arch.h
@@ -404,7 +404,6 @@
 
 /* A57 CPUACTLR definitions */
 #define CPUACTLR_NO_ALLOC_WBWA	(1 << 49)
-#define CPUACTLR_DIS_DMB_NULL	(1 << 58)
 #define CPUACTLR_DCC_AS_DCCI	(1 << 44)
 
 /*******************************************************************************
diff --git a/lib/aarch64/cpu_helpers.S b/lib/aarch64/cpu_helpers.S
index 008d39d..8d063c4 100644
--- a/lib/aarch64/cpu_helpers.S
+++ b/lib/aarch64/cpu_helpers.S
@@ -56,7 +56,6 @@
 	cmp	x1, #0		// Minor Revision 0
 	b.ne	smp_setup_begin
 	mov	x1, #CPUACTLR_NO_ALLOC_WBWA
-	orr	x1, x1, #CPUACTLR_DIS_DMB_NULL
 	orr	x1, x1, #CPUACTLR_DCC_AS_DCCI
 	mrs	x0, CPUACTLR_EL1
 	orr	x0, x0, x1