diff --git a/common/source/java/ch/systemsx/cisd/common/filesystem/AbstractCopyActivitySensor.java b/common/source/java/ch/systemsx/cisd/common/filesystem/AbstractCopyActivitySensor.java
index b8e698715c7d97b7c610f5c50bad2ab26ec248ee..1553815f1303fd204aef80ed6aaa5741552c22db 100644
--- a/common/source/java/ch/systemsx/cisd/common/filesystem/AbstractCopyActivitySensor.java
+++ b/common/source/java/ch/systemsx/cisd/common/filesystem/AbstractCopyActivitySensor.java
@@ -93,7 +93,7 @@ public abstract class AbstractCopyActivitySensor implements IDescribingActivityS
             if (errorCount <= maxErrorsToIgnore)
             {
                 timeOfLastReportedActivity = now;
-                getMachineLog().error(
+                getMachineLog().warn(
                         describeInactivity(now)
                                 + String.format(" (error count: %d <= %d, goes unreported)",
                                         errorCount, maxErrorsToIgnore));