diff --git a/screening/source/java/ch/systemsx/cisd/openbis/dss/etl/HCSImageFileExtractor.java b/screening/source/java/ch/systemsx/cisd/openbis/dss/etl/HCSImageFileExtractor.java
index ce09eb2110363d619a19ee4fae86b30d0cf13211..2fa55ea0b2b0ea8059acc9b7eb9854696996cd35 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/dss/etl/HCSImageFileExtractor.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/dss/etl/HCSImageFileExtractor.java
@@ -99,7 +99,7 @@ public class HCSImageFileExtractor extends AbstractHCSImageFileExtractor
 
             if (tileMapperOrNull != null)
             {
-                tileMapperOrNull.tryGetLocation(tileNumber);
+                return tileMapperOrNull.tryGetLocation(tileNumber);
             } else
             {
                 Location letterLoc =