diff --git a/internal/middleware/device_auth.go b/internal/middleware/device_auth.go
index 8a45663..a964def 100644
--- a/internal/middleware/device_auth.go
+++ b/internal/middleware/device_auth.go
@@ -88,7 +88,7 @@ func (m *DeviceAuthMiddleware) Authenticate(next echo.HandlerFunc) echo.HandlerF
 
 		remaining := m.rateLimiter.GetRemainingRequests(deviceID, requestType, config)
 		c.Response().Header().Set("X-RateLimit-Limit", "60")
-		c.Response().Header().Set("X-RateLimit-Remaining", string(rune(remaining)))
+		c.Response().Header().Set("X-RateLimit-Remaining", strconv.Itoa(remaining))
 
 		ctx := DeviceContext{
 			ID:               device.ID.Bytes,