diff --git a/PVE/API2/Ceph.pm b/PVE/API2/Ceph.pm
index 6424f02f..6e7a8879 100644
--- a/PVE/API2/Ceph.pm
+++ b/PVE/API2/Ceph.pm
@@ -1205,7 +1205,7 @@ __PACKAGE__->register_method ({
 		description => 'Ceph service name.',
 		type => 'string',
 		optional => 1,
-		pattern => '(mon|mds|osd|mgr)\.[A-Za-z0-9]{1,32}',
+		pattern => '(mon|mds|osd|mgr)\.[A-Za-z0-9\-]{1,32}',
 	    },
 	},
     },
@@ -1255,7 +1255,7 @@ __PACKAGE__->register_method ({
 		description => 'Ceph service name.',
 		type => 'string',
 		optional => 1,
-		pattern => '(mon|mds|osd|mgr)\.[A-Za-z0-9]{1,32}',
+		pattern => '(mon|mds|osd|mgr)\.[A-Za-z0-9\-]{1,32}',
 	    },
 	},
     },