diff --git a/src/phenCryo.ttl b/src/phenCryo.ttl
index dac2860..ea4846d 100644
--- a/src/phenCryo.ttl
+++ b/src/phenCryo.ttl
@@ -104,9 +104,7 @@ sophcr:Glaciation rdf:type owl:Class ;
 
 ###  http://sweetontology.net/phenCryo/GlacierRetreat
 sophcr:GlacierRetreat rdf:type owl:Class ;
-                     rdfs:subClassOf sophcr:GlacialProcess ,
-                                     sophsy:Retreat,
-                                     soprocsc:Melting ;
+                     rdfs:subClassOf sophcr:GlacialProcess ;
                      rdfs:label "glacier retreat"@en ;
                      rdfs:seeAlso <https://github.com/ESIPFed/sweet/issues/185> ;
                      skos:closeMatch <http://purl.obolibrary.org/obo/ENVO_01001656> ;