diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 7824df2..a9c6fda 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -119,6 +119,10 @@
 # only to revision <= r0p3 of the Cortex A72 cpu.
 ERRATA_A72_859971	?=0
 
+# Flag to apply erratum 855423 workaround during reset. This erratum applies
+# only to revision <= r0p1 of the Cortex A73 cpu.
+ERRATA_A73_855423	?=0
+
 # Flag to apply T32 CLREX workaround during reset. This erratum applies
 # only to r0p0 and r1p0 of the Neoverse N1 cpu.
 ERRATA_N1_1043202	?=1
@@ -188,6 +192,10 @@
 $(eval $(call assert_boolean,ERRATA_A72_859971))
 $(eval $(call add_define,ERRATA_A72_859971))
 
+# Process ERRATA_A73_855423 flag
+$(eval $(call assert_boolean,ERRATA_A73_855423))
+$(eval $(call add_define,ERRATA_A73_855423))
+
 # Process ERRATA_N1_1043202 flag
 $(eval $(call assert_boolean,ERRATA_N1_1043202))
 $(eval $(call add_define,ERRATA_N1_1043202))