diff --git a/hw/ip/kmac/dv/env/kmac_env_cov.sv b/hw/ip/kmac/dv/env/kmac_env_cov.sv
index a846c3da6110d..0a9250ef24a53 100644
--- a/hw/ip/kmac/dv/env/kmac_env_cov.sv
+++ b/hw/ip/kmac/dv/env/kmac_env_cov.sv
@@ -301,8 +301,7 @@ class kmac_env_cov extends cip_base_env_cov #(.CFG_T(kmac_env_cfg));
     kmac_err_code: coverpoint kmac_err {
       ignore_bins ignore = {kmac_pkg::ErrNone};
       // Covered by direct sequence, if scb enabled for those seq, can remove it from this list.
-      illegal_bins il = {kmac_pkg::ErrShadowRegUpdate,
-                         kmac_pkg::ErrWaitTimerExpired,
+      illegal_bins il = {kmac_pkg::ErrWaitTimerExpired,
                          kmac_pkg::ErrIncorrectEntropyMode,
                          kmac_pkg::ErrSwHashingWithoutEntropyReady};
     }
diff --git a/hw/ip/kmac/rtl/kmac_pkg.sv b/hw/ip/kmac/rtl/kmac_pkg.sv
index b328b2ab053c5..2677255faf5bc 100644
--- a/hw/ip/kmac/rtl/kmac_pkg.sv
+++ b/hw/ip/kmac/rtl/kmac_pkg.sv
@@ -456,9 +456,6 @@ package kmac_pkg;
     //  - Sw issues KMAC op without Entropy setting.
     ErrSwHashingWithoutEntropyReady = 8'h 09,
 
-    // Error Shadow register update
-    ErrShadowRegUpdate = 8'h C0,
-
     // Error due to lc_escalation_en_i or fatal fault
     ErrFatalError = 8'h C1,
 
diff --git a/sw/device/lib/dif/dif_kmac.h b/sw/device/lib/dif/dif_kmac.h
index bc23856b408e8..3eaee3350fa4b 100644
--- a/sw/device/lib/dif/dif_kmac.h
+++ b/sw/device/lib/dif/dif_kmac.h
@@ -402,8 +402,6 @@ typedef enum dif_kmac_error {
 
   kDifErrorSoftwareHashingWithoutEntropyReady = 9,
 
-  kDifErrorShadowRegisterUpdate = 0xC0,
-
   kDifErrorFatalError = 0xC1,
 
   kDifErrorPackerIntegrity = 0xC2,
diff --git a/sw/device/lib/dif/dif_kmac_unittest.cc b/sw/device/lib/dif/dif_kmac_unittest.cc
index 7bfc819d8881e..6e614db138007 100644
--- a/sw/device/lib/dif/dif_kmac_unittest.cc
+++ b/sw/device/lib/dif/dif_kmac_unittest.cc
@@ -792,7 +792,6 @@ class KmacGetErrorTest : public KmacTest {
       kDifErrorIncorrectFunctionName,
       kDifErrorSoftwareCommandSequence,
       kDifErrorSoftwareHashingWithoutEntropyReady,
-      kDifErrorShadowRegisterUpdate,
       kDifErrorFatalError,
       kDifErrorPackerIntegrity,
       kDifErrorMsgFifoIntegrity,