diff --git a/libraries/AP_IRLock/AP_IRLock_SITL.h b/libraries/AP_IRLock/AP_IRLock_SITL.h
index 1e0624b3e0..33f091ca77 100644
--- a/libraries/AP_IRLock/AP_IRLock_SITL.h
+++ b/libraries/AP_IRLock/AP_IRLock_SITL.h
@@ -20,7 +20,7 @@ public:
     bool update() override;
 
 private:
-    SITL::SITL          *_sitl;                 // sitl instance pointer
+    SITL::SIM          *_sitl;                 // sitl instance pointer
     uint32_t _last_timestamp = 0;
 };
 #endif // CONFIG_HAL_BOARD
diff --git a/libraries/AP_IRLock/AP_IRLock_SITL_Gazebo.cpp b/libraries/AP_IRLock/AP_IRLock_SITL_Gazebo.cpp
index efbbc91624..cbb420ac05 100644
--- a/libraries/AP_IRLock/AP_IRLock_SITL_Gazebo.cpp
+++ b/libraries/AP_IRLock/AP_IRLock_SITL_Gazebo.cpp
@@ -38,7 +38,7 @@ AP_IRLock_SITL_Gazebo::AP_IRLock_SITL_Gazebo() :
 
 void AP_IRLock_SITL_Gazebo::init(int8_t bus)
 {
-    SITL::SITL *sitl = AP::sitl();
+    SITL::SIM *sitl = AP::sitl();
     // try to bind to a specific port so that if we restart ArduPilot
     // Gazebo keeps sending us packets. Not strictly necessary but
     // useful for debugging