diff --git a/libraries/AP_Radio/AP_Radio.cpp b/libraries/AP_Radio/AP_Radio.cpp
index 40b8e4bfd8..642e351092 100644
--- a/libraries/AP_Radio/AP_Radio.cpp
+++ b/libraries/AP_Radio/AP_Radio.cpp
@@ -134,7 +134,7 @@ const AP_Param::GroupInfo AP_Radio::var_info[] = {
     AP_GROUPEND
 };
 
-AP_Radio *AP_Radio::_instance;
+AP_Radio *AP_Radio::_singleton;
 
 // constructor
 AP_Radio::AP_Radio(void)
diff --git a/libraries/AP_Radio/AP_Radio_cc2500.h b/libraries/AP_Radio/AP_Radio_cc2500.h
index f4d1cbb28d..2bf51d2097 100644
--- a/libraries/AP_Radio/AP_Radio_cc2500.h
+++ b/libraries/AP_Radio/AP_Radio_cc2500.h
@@ -76,7 +76,7 @@ public:
     
 private:
     AP_HAL::OwnPtr<AP_HAL::SPIDevice> dev;
-    static AP_Radio_cc2500 *radio_instance;
+    static AP_Radio_cc2500 *radio_singleton;
     static thread_t *_irq_handler_ctx;
     static virtual_timer_t timeout_vt;