diff --git a/ontology definitions/tosca-builtins.ttl b/ontology definitions/tosca-builtins.ttl
index 2bde2be..7ea9402 100644
--- a/ontology definitions/tosca-builtins.ttl	
+++ b/ontology definitions/tosca-builtins.ttl	
@@ -1775,6 +1775,10 @@ DUL:hasParameter
 :host
   rdf:type rdf:Property ;
 .
+:float
+  rdf:type owl:Class ;
+  rdfs:subClassOf :DataType ;
+.
 :implementation
   rdf:type rdf:Property ;
 .