diff --git a/rtd_yeastx/source/java/ch/systemsx/cisd/yeastx/etl/DatasetMappingUtil.java b/rtd_yeastx/source/java/ch/systemsx/cisd/yeastx/etl/DatasetMappingUtil.java
index f160106327df91251342fb948b18ab28ec2f5822..b0cfbcf109fda964864d65be552e254f59df0327 100644
--- a/rtd_yeastx/source/java/ch/systemsx/cisd/yeastx/etl/DatasetMappingUtil.java
+++ b/rtd_yeastx/source/java/ch/systemsx/cisd/yeastx/etl/DatasetMappingUtil.java
@@ -300,7 +300,7 @@ class DatasetMappingUtil
             FileNotFoundException
     {
         FileInputStream stream = new FileInputStream(mappingFile);
-        List lines = IOUtils.readLines(stream);
+        List<String> lines = IOUtils.readLines(stream);
         IOUtils.closeQuietly(stream);
         return lines;
     }