diff --git a/rtd_phosphonetx/etc/service.properties b/rtd_phosphonetx/etc/service.properties
index 9d1bfc2a27ef79b883ec4e31b39b79996cf42969..f140b068780abb28f186d79868586a16f99a2403 100644
--- a/rtd_phosphonetx/etc/service.properties
+++ b/rtd_phosphonetx/etc/service.properties
@@ -184,7 +184,7 @@ prot-result.incoming-data-completeness-condition = auto-detection
 # ---------------- Plugin properties
 # The extractor class to use for code extraction
 prot-result.data-set-info-extractor = ch.systemsx.cisd.openbis.etlserver.phosphonetx.DataSetInfoExtractorForSearchExperiment
-
+prot-result.data-set-info-extractor.separator = +
 # The extractor class to use for type extraction
 prot-result.type-extractor = ch.systemsx.cisd.etlserver.SimpleTypeExtractor
 prot-result.type-extractor.file-format-type = XML