diff --git a/.pending/bugfixes/sdk/4273-Fix-usage-of-Ap b/.pending/bugfixes/sdk/4273-Fix-usage-of-Ap
new file mode 100644
index 0000000000..d2933b5f73
--- /dev/null
+++ b/.pending/bugfixes/sdk/4273-Fix-usage-of-Ap
@@ -0,0 +1 @@
+#4273 Fix usage of AppendTags in x/staking/handler.go
diff --git a/x/staking/handler.go b/x/staking/handler.go
index bfff581f05..762260c9ab 100644
--- a/x/staking/handler.go
+++ b/x/staking/handler.go
@@ -66,7 +66,7 @@ func EndBlocker(ctx sdk.Context, k keeper.Keeper) ([]abci.ValidatorUpdate, sdk.T
 			continue
 		}
 
-		resTags.AppendTags(sdk.NewTags(
+		resTags = resTags.AppendTags(sdk.NewTags(
 			tags.Action, tags.ActionCompleteUnbonding,
 			tags.Delegator, dvPair.DelegatorAddress.String(),
 			tags.SrcValidator, dvPair.ValidatorAddress.String(),
@@ -82,7 +82,7 @@ func EndBlocker(ctx sdk.Context, k keeper.Keeper) ([]abci.ValidatorUpdate, sdk.T
 			continue
 		}
 
-		resTags.AppendTags(sdk.NewTags(
+		resTags = resTags.AppendTags(sdk.NewTags(
 			tags.Action, tags.ActionCompleteRedelegation,
 			tags.Category, tags.TxCategory,
 			tags.Delegator, dvvTriplet.DelegatorAddress.String(),