diff --git a/GattService.cpp b/GattService.cpp
index 1f78b15..1e1924e 100644
--- a/GattService.cpp
+++ b/GattService.cpp
@@ -36,7 +36,7 @@
     @endcode
 */
 /**************************************************************************/
-GattService::GattService(UUID uuid) : primaryServiceID(uuid), characteristicCount(0), characteristics(), handle(0)
+GattService::GattService(const UUID &uuid) : primaryServiceID(uuid), characteristicCount(0), characteristics(), handle(0)
 {
     /* empty */
 }
diff --git a/GattService.h b/GattService.h
index b9d6104..700904d 100644
--- a/GattService.h
+++ b/GattService.h
@@ -34,7 +34,7 @@ class GattService
 private:
 
 public:
-    GattService(UUID uuid);
+    GattService(const UUID &uuid);
     virtual ~GattService(void);
 
     ble_error_t addCharacteristic(GattCharacteristic &);