diff --git a/x/authz/keeper/keeper.go b/x/authz/keeper/keeper.go
index 788b87418e23..211474bccb1c 100644
--- a/x/authz/keeper/keeper.go
+++ b/x/authz/keeper/keeper.go
@@ -1,6 +1,7 @@
 package keeper
 
 import (
+	"encoding/base64"
 	"fmt"
 	"strconv"
 	"time"
@@ -101,7 +102,7 @@ func (k Keeper) DispatchActions(ctx sdk.Context, grantee sdk.AccAddress, msgs []
 
 			grant, found := k.getGrant(ctx, skey)
 			if !found {
-				return nil, sdkerrors.Wrapf(authz.ErrNoAuthorizationFound, "failed to update grant with key %s", string(skey))
+				return nil, sdkerrors.Wrapf(authz.ErrNoAuthorizationFound, "failed to update grant with key %s", base64.StdEncoding.EncodeToString(skey))
 			}
 
 			if grant.Expiration != nil && grant.Expiration.Before(now) {