diff --git a/newton-4.00/applications/ndSandbox/demos/ndAdvancedIndustrialRobot.cpp b/newton-4.00/applications/ndSandbox/demos/ndAdvancedIndustrialRobot.cpp
index 5889c1635..529152408 100644
--- a/newton-4.00/applications/ndSandbox/demos/ndAdvancedIndustrialRobot.cpp
+++ b/newton-4.00/applications/ndSandbox/demos/ndAdvancedIndustrialRobot.cpp
@@ -1203,14 +1203,14 @@ namespace ndAdvancedRobot
 					{
 						m_maxScore = rewardTrajectory;
 						m_bestActor->CopyFrom(*m_master->GetActor());
-						ndExpandTraceMessage("best actor episode: %d\treward %f\ttrajectoryFrames: %f\n", m_master->GetEposideCount(), 100.0f * m_master->GetAverageScore() / m_horizon, m_master->GetAverageFrames());
+						ndExpandTraceMessage("best actor episode: %u\treward %f\ttrajectoryFrames: %f\n", m_master->GetEposideCount(), 100.0f * m_master->GetAverageScore() / m_horizon, m_master->GetAverageFrames());
 						m_lastEpisode = m_master->GetEposideCount();
 					}
 				}
 			
 				if (episodeCount && !m_master->IsSampling())
 				{
-					ndExpandTraceMessage("steps: %d\treward: %g\t  trajectoryFrames: %g\n", m_master->GetFramesCount(), 100.0f * m_master->GetAverageScore() / m_horizon, m_master->GetAverageFrames());
+					ndExpandTraceMessage("steps: %u\treward: %g\t  trajectoryFrames: %g\n", m_master->GetFramesCount(), 100.0f * m_master->GetAverageScore() / m_horizon, m_master->GetAverageFrames());
 					if (m_outFile)
 					{
 						fprintf(m_outFile, "%g\n", m_master->GetAverageScore());