diff --git a/generate/property.go b/generate/property.go
index 74bb587f61..e314c096a8 100644
--- a/generate/property.go
+++ b/generate/property.go
@@ -204,7 +204,6 @@ func (p Property) HasValidType() bool {
 // IsPolymorphic checks whether a property can be multiple different types
 func (p Property) IsPolymorphic() bool {
 	return len(p.PrimitiveTypes) > 0 ||
-		len(p.PrimitiveItemTypes) > 0 ||
 		len(p.PrimitiveItemTypes) > 0 ||
 		len(p.ItemTypes) > 0 ||
 		len(p.Types) > 0 ||