diff --git a/silecs-model/src/xml/DeploySchema.xsd b/silecs-model/src/xml/DeploySchema.xsd
index 6ad37c99bc26352ba7b7d500f3a029ac9cb2582e..4a185a32f9f7ca1f388560b63b296835bad06583 100644
--- a/silecs-model/src/xml/DeploySchema.xsd
+++ b/silecs-model/src/xml/DeploySchema.xsd
@@ -568,7 +568,7 @@
     <xs:simpleType name="HostNameType">
         <xs:restriction base="xs:string">
             <xs:minLength value="1" />
-            <xs:pattern value="[_A-Za-z0-9]*" />
+            <xs:pattern value="[-._A-Za-z0-9]*" />
         </xs:restriction>
     </xs:simpleType>
     <xs:simpleType name="DeployNameType">