diff --git a/csaf/advisory.go b/csaf/advisory.go
index c4966bf..14ed3fa 100644
--- a/csaf/advisory.go
+++ b/csaf/advisory.go
@@ -386,7 +386,7 @@ type Branches []*Branch
 // ProductTree contains product names that can be referenced elsewhere in the document.
 type ProductTree struct {
 	Branches         Branches           `json:"branches,omitempty"`
-	FullProductNames []*FullProductName `json:"full_product_name,omitempty"`
+	FullProductNames []*FullProductName `json:"full_product_names,omitempty"`
 	ProductGroups    *ProductGroups     `json:"product_groups,omitempty"`
 	RelationShips    []*Relationship    `json:"relationships,omitempty"`
 }