diff --git a/src/AutoPilotPlugins/PX4/Tests/FlightModeConfigTest.cc b/src/AutoPilotPlugins/PX4/Tests/FlightModeConfigTest.cc
index c5ddb7093af3ef8dde9251becb94a54e4ed83a6d..0fc4b09dc41812ad44a58ec916662d17be6fc64d 100644
--- a/src/AutoPilotPlugins/PX4/Tests/FlightModeConfigTest.cc
+++ b/src/AutoPilotPlugins/PX4/Tests/FlightModeConfigTest.cc
@@ -140,6 +140,7 @@ void FlightModeConfigTest::cleanup(void)
     delete _mockUASManager;
     
     _mapChannelCombo2Param.clear();
+    _mapChannelCombo2ButtonGroup.clear();
 }
 
 /// @brief Returns channel mapping for the specified parameters