diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f9a8aa8980a..4058ea0b6270 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -178,6 +178,7 @@ to detail this new feature and how state transitions occur.
 
 * (cli) [\#4763](https://github.com/cosmos/cosmos-sdk/issues/4763) Fix flag `--min-self-delegation` for staking `EditValidator`
 * (keys) Fix ledger custom coin type support bug
+* (x/gov) [\#5107](https://github.com/cosmos/cosmos-sdk/pull/5107) Sum validator operator's all voting power when tally votes
 * (baseapp) [\#5200](https://github.com/cosmos/cosmos-sdk/issues/5200) Remove duplicate events from previous messages.
 
 ## [v0.37.2] - 2019-10-10
diff --git a/x/gov/keeper/tally.go b/x/gov/keeper/tally.go
index 1bd9082031a6..f6b0008d4052 100644
--- a/x/gov/keeper/tally.go
+++ b/x/gov/keeper/tally.go
@@ -35,30 +35,31 @@ func (keeper Keeper) Tally(ctx sdk.Context, proposal types.Proposal) (passes boo
 
 	keeper.IterateVotes(ctx, proposal.ProposalID, func(vote types.Vote) bool {
 		// if validator, just record it in the map
-		// if delegator tally voting power
 		valAddrStr := sdk.ValAddress(vote.Voter).String()
 		if val, ok := currValidators[valAddrStr]; ok {
 			val.Vote = vote.Option
 			currValidators[valAddrStr] = val
-		} else {
-			// iterate over all delegations from voter, deduct from any delegated-to validators
-			keeper.sk.IterateDelegations(ctx, vote.Voter, func(index int64, delegation exported.DelegationI) (stop bool) {
-				valAddrStr := delegation.GetValidatorAddr().String()
+		}
 
-				if val, ok := currValidators[valAddrStr]; ok {
-					val.DelegatorDeductions = val.DelegatorDeductions.Add(delegation.GetShares())
-					currValidators[valAddrStr] = val
+		// iterate over all delegations from voter, deduct from any delegated-to validators
+		keeper.sk.IterateDelegations(ctx, vote.Voter, func(index int64, delegation exported.DelegationI) (stop bool) {
+			valAddrStr := delegation.GetValidatorAddr().String()
 
-					delegatorShare := delegation.GetShares().Quo(val.DelegatorShares)
-					votingPower := delegatorShare.MulInt(val.BondedTokens)
+			if val, ok := currValidators[valAddrStr]; ok {
+				// There is no need to handle the special case that validator address equal to voter address.
+				// Because voter's voting power will tally again even if there will deduct voter's voting power from validator.
+				val.DelegatorDeductions = val.DelegatorDeductions.Add(delegation.GetShares())
+				currValidators[valAddrStr] = val
 
-					results[vote.Option] = results[vote.Option].Add(votingPower)
-					totalVotingPower = totalVotingPower.Add(votingPower)
-				}
+				delegatorShare := delegation.GetShares().Quo(val.DelegatorShares)
+				votingPower := delegatorShare.MulInt(val.BondedTokens)
 
-				return false
-			})
-		}
+				results[vote.Option] = results[vote.Option].Add(votingPower)
+				totalVotingPower = totalVotingPower.Add(votingPower)
+			}
+
+			return false
+		})
 
 		keeper.deleteVote(ctx, vote.ProposalID, vote.Voter)
 		return false
diff --git a/x/gov/keeper/tally_test.go b/x/gov/keeper/tally_test.go
index dcf370289565..ceaed4eb4437 100644
--- a/x/gov/keeper/tally_test.go
+++ b/x/gov/keeper/tally_test.go
@@ -396,3 +396,41 @@ func TestTallyJailedValidator(t *testing.T) {
 	require.False(t, burnDeposits)
 	require.False(t, tallyResults.Equals(types.EmptyTallyResult()))
 }
+
+func TestTallyValidatorMultipleDelegations(t *testing.T) {
+	ctx, _, keeper, sk, _ := createTestInput(t, false, 100)
+	createValidators(ctx, sk, []int64{10, 10, 10})
+
+	delTokens := sdk.TokensFromConsensusPower(10)
+	val2, found := sk.GetValidator(ctx, valOpAddr2)
+	require.True(t, found)
+
+	_, err := sk.Delegate(ctx, valAccAddr1, delTokens, sdk.Unbonded, val2, true)
+	require.NoError(t, err)
+
+	tp := TestProposal
+	proposal, err := keeper.SubmitProposal(ctx, tp)
+	require.NoError(t, err)
+	proposalID := proposal.ProposalID
+	proposal.Status = types.StatusVotingPeriod
+	keeper.SetProposal(ctx, proposal)
+
+	require.NoError(t, keeper.AddVote(ctx, proposalID, valAccAddr1, types.OptionYes))
+	require.NoError(t, keeper.AddVote(ctx, proposalID, valAccAddr2, types.OptionNo))
+	require.NoError(t, keeper.AddVote(ctx, proposalID, valAccAddr3, types.OptionYes))
+
+	proposal, ok := keeper.GetProposal(ctx, proposalID)
+	require.True(t, ok)
+	passes, burnDeposits, tallyResults := keeper.Tally(ctx, proposal)
+
+	require.True(t, passes)
+	require.False(t, burnDeposits)
+
+	expectedYes := sdk.TokensFromConsensusPower(30)
+	expectedAbstain := sdk.TokensFromConsensusPower(0)
+	expectedNo := sdk.TokensFromConsensusPower(10)
+	expectedNoWithVeto := sdk.TokensFromConsensusPower(0)
+	expectedTallyResult := types.NewTallyResult(expectedYes, expectedAbstain, expectedNo, expectedNoWithVeto)
+
+	require.True(t, tallyResults.Equals(expectedTallyResult))
+}