diff --git a/CHANGELOG.md b/CHANGELOG.md
index f11371c63493..6461297889d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,6 +41,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * (x/authz) [#13047](https://github.com/cosmos/cosmos-sdk/pull/13047) Add a GetAuthorization function to the keeper.
 
+### Improvements
+
+* (x/auth) [#13048](https://github.com/cosmos/cosmos-sdk/pull/13048) Add handling of AccountNumberStoreKeyPrefix to the simulation decoder.
+
 ### Bug Fixes
 
 * (export) [#13029](https://github.com/cosmos/cosmos-sdk/pull/13029) Fix exporting the blockParams regression.
diff --git a/x/auth/simulation/decoder.go b/x/auth/simulation/decoder.go
index 61a551ba5208..df4a202744f1 100644
--- a/x/auth/simulation/decoder.go
+++ b/x/auth/simulation/decoder.go
@@ -7,6 +7,7 @@ import (
 	gogotypes "github.com/gogo/protobuf/types"
 
 	"github.com/cosmos/cosmos-sdk/codec"
+	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/kv"
 	"github.com/cosmos/cosmos-sdk/x/auth/types"
 )
@@ -41,6 +42,20 @@ func NewDecodeStore(ak AuthUnmarshaler) func(kvA, kvB kv.Pair) string {
 
 			return fmt.Sprintf("GlobalAccNumberA: %d\nGlobalAccNumberB: %d", globalAccNumberA, globalAccNumberB)
 
+		case bytes.HasPrefix(kvA.Key, types.AccountNumberStoreKeyPrefix):
+			var accNumA, accNumB sdk.AccAddress
+			err := accNumA.Unmarshal(kvA.Value)
+			if err != nil {
+				panic(err)
+			}
+
+			err = accNumB.Unmarshal(kvB.Value)
+			if err != nil {
+				panic(err)
+			}
+
+			return fmt.Sprintf("AccNumA: %s\nAccNumB: %s", accNumA, accNumB)
+
 		default:
 			panic(fmt.Sprintf("unexpected %s key %X (%s)", types.ModuleName, kvA.Key, kvA.Key))
 		}
diff --git a/x/auth/simulation/decoder_test.go b/x/auth/simulation/decoder_test.go
index c79f5c4595d9..95a966a005fa 100644
--- a/x/auth/simulation/decoder_test.go
+++ b/x/auth/simulation/decoder_test.go
@@ -41,6 +41,10 @@ func TestDecodeStore(t *testing.T) {
 				Key:   types.GlobalAccountNumberKey,
 				Value: cdc.MustMarshal(&globalAccNumber),
 			},
+			{
+				Key:   types.AccountNumberStoreKey(5),
+				Value: acc.GetAddress().Bytes(),
+			},
 			{
 				Key:   []byte{0x99},
 				Value: []byte{0x99},
@@ -53,6 +57,7 @@ func TestDecodeStore(t *testing.T) {
 	}{
 		{"Account", fmt.Sprintf("%v\n%v", acc, acc)},
 		{"GlobalAccNumber", fmt.Sprintf("GlobalAccNumberA: %d\nGlobalAccNumberB: %d", globalAccNumber, globalAccNumber)},
+		{"AccNum", fmt.Sprintf("AccNumA: %s\nAccNumB: %s", acc.GetAddress(), acc.GetAddress())},
 		{"other", ""},
 	}