diff --git a/Makefile b/Makefile
index 46173cf..fb55df4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,11 @@
-VPKG=dynatron.me/x/stillbox/pkg/gordio/version
+VPKG=dynatron.me/x/stillbox/internal/version
 VER!=git describe --tags --always --dirty
 BUILDDATE!=date '+%Y-%m-%e'
 LDFLAGS=-ldflags="-X '${VPKG}.Version=${VER}' -X '${VPKG}.Built=${BUILDDATE}'"
+
 all: checkcalls
 	go build -o gordio ${LDFLAGS} ./cmd/gordio/
-	go build -o calls ./cmd/calls/
+	go build -o calls ${LDFLAGS} ./cmd/calls/
 
 clean:
 	rm -rf client/calls/ && mkdir client/calls && touch client/calls/.gitkeep
diff --git a/cmd/calls/main.go b/cmd/calls/main.go
index b2bd07c..5b01d45 100644
--- a/cmd/calls/main.go
+++ b/cmd/calls/main.go
@@ -13,12 +13,17 @@ import (
 	"strings"
 	"time"
 
+	"dynatron.me/x/stillbox/internal/version"
 	"dynatron.me/x/stillbox/pkg/pb"
 
 	"github.com/gorilla/websocket"
 	"google.golang.org/protobuf/proto"
 )
 
+const (
+	AppName = "calls-tui"
+)
+
 var (
 	addr     = flag.String("addr", "localhost:8080", "http service address")
 	username = flag.String("user", "", "username")
@@ -41,7 +46,8 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	loginReq.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+	loginReq.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	version.UserAgent(loginReq.Header, AppName)
 
 	jar, err := cookiejar.New(nil)
 	if err != nil {
@@ -74,7 +80,9 @@ func main() {
 		HandshakeTimeout: 45 * time.Second,
 		Jar:              jar,
 	}
-	c, _, err := dialer.Dial(u.String(), nil)
+	wsHdr := make(http.Header)
+	version.UserAgent(wsHdr, AppName)
+	c, _, err := dialer.Dial(u.String(), wsHdr)
 	if err != nil {
 		log.Fatal("dial:", err)
 	}
diff --git a/cmd/gordio/main.go b/cmd/gordio/main.go
index 207c6b1..b1c0265 100644
--- a/cmd/gordio/main.go
+++ b/cmd/gordio/main.go
@@ -10,7 +10,7 @@ import (
 	"dynatron.me/x/stillbox/pkg/gordio"
 	"dynatron.me/x/stillbox/pkg/gordio/admin"
 	"dynatron.me/x/stillbox/pkg/gordio/config"
-	"dynatron.me/x/stillbox/pkg/gordio/version"
+	"dynatron.me/x/stillbox/internal/version"
 
 	"github.com/spf13/cobra"
 )
diff --git a/pkg/gordio/version/version.go b/internal/version/version.go
similarity index 59%
rename from pkg/gordio/version/version.go
rename to internal/version/version.go
index cbd6533..cb680aa 100644
--- a/pkg/gordio/version/version.go
+++ b/internal/version/version.go
@@ -2,6 +2,7 @@ package version
 
 import (
 	"fmt"
+	"net/http"
 	"runtime"
 )
 
@@ -15,3 +16,7 @@ func String() string {
 	return fmt.Sprintf("gordio %s\nbuilt %s for %s-%s\n",
 		Version, Built, runtime.GOOS, runtime.GOARCH)
 }
+
+func UserAgent(hdr http.Header, app string) {
+	hdr.Set("User-Agent", fmt.Sprintf("stillbox %s/%s (%s/%s)", app, Version, runtime.GOOS, runtime.GOARCH))
+}
diff --git a/pkg/gordio/nexus/client.go b/pkg/gordio/nexus/client.go
index 63e1e18..475a72b 100644
--- a/pkg/gordio/nexus/client.go
+++ b/pkg/gordio/nexus/client.go
@@ -9,7 +9,7 @@ import (
 
 	"dynatron.me/x/stillbox/pkg/calls"
 	"dynatron.me/x/stillbox/pkg/gordio/database"
-	"dynatron.me/x/stillbox/pkg/gordio/version"
+	"dynatron.me/x/stillbox/internal/version"
 	"dynatron.me/x/stillbox/pkg/pb"
 
 	"github.com/rs/zerolog/log"