diff --git a/examples/gamepad/main.go b/examples/gamepad/main.go
index f68e25ff4..f692c77f7 100644
--- a/examples/gamepad/main.go
+++ b/examples/gamepad/main.go
@@ -83,7 +83,7 @@ func update(screen *ebiten.Image) error {
 	str := ""
 	if len(ids) > 0 {
 		for _, id := range ids {
-			str += fmt.Sprintf("Gamepad (ID: %d):\n", id)
+			str += fmt.Sprintf("Gamepad (ID: %d, SDL ID: %s):\n", id, ebiten.GamepadSDLID(id))
 			str += fmt.Sprintf("  Axes:    %s\n", strings.Join(axes[id], ", "))
 			str += fmt.Sprintf("  Buttons: %s\n", strings.Join(pressedButtons[id], ", "))
 			str += "\n"
diff --git a/internal/uidriver/js/input.go b/internal/uidriver/js/input.go
index 7be939567..edf5a82b2 100644
--- a/internal/uidriver/js/input.go
+++ b/internal/uidriver/js/input.go
@@ -17,6 +17,7 @@
 package js
 
 import (
+	"encoding/hex"
 	"syscall/js"
 	"unicode"
 
@@ -58,9 +59,14 @@ func (i *Input) CursorPosition() (x, y int) {
 }
 
 func (i *Input) GamepadSDLID(id int) string {
-	// TODO: Implement this. See the implementation of SDL:
-	// https://github.com/spurious/SDL-mirror/blob/master/src/joystick/emscripten/SDL_sysjoystick.c
-	return ""
+	// This emulates the implementation of EMSCRIPTEN_JoystickGetDeviceGUID.
+	// https://hg.libsdl.org/SDL/file/bc90ce38f1e2/src/joystick/emscripten/SDL_sysjoystick.c#l385
+	if len(i.gamepads) <= id {
+		return ""
+	}
+	var sdlid [16]byte
+	copy(sdlid[:], []byte(i.gamepads[id].name))
+	return hex.EncodeToString(sdlid[:])
 }
 
 // GamepadName returns a string containing some information about the controller.