diff --git a/cmd/teamflag.go b/cmd/teamflag.go
index e581c6a..1649392 100644
--- a/cmd/teamflag.go
+++ b/cmd/teamflag.go
@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"errors"
+	"strings"
 )
 
 type TeamFlag string
@@ -12,6 +13,7 @@ func (t *TeamFlag) String() string {
 
 func (t *TeamFlag) Set(v string) error {
 	var err error
+	v = strings.ToLower(v)
 	_, ok := teamIDs[v]
 	if !ok {
 		err = errors.New("invalid team ID")