diff --git a/src/main/resources/com/adobe/epubcheck/schema/30/package-30.rnc b/src/main/resources/com/adobe/epubcheck/schema/30/package-30.rnc
index 8d5ba0873..e3fbdb27a 100644
--- a/src/main/resources/com/adobe/epubcheck/schema/30/package-30.rnc
+++ b/src/main/resources/com/adobe/epubcheck/schema/30/package-30.rnc
@@ -26,10 +26,11 @@
    opf.epub3.meta.content = (opf.property.attr & opf.refines.attr? & opf.id.attr? & opf.scheme.attr? & opf.i18n.attrs & datatype.string.nonempty)
    opf.epub2.meta.content = (attribute name { text } & attribute content { text })  #legacy
    
-   opf.link = element link { opf.href.attr & opf.rel.attr & opf.id.attr? & opf.refines.attr? & opf.media-type.attr? & opf.properties.attr? }         
+   opf.link = element link { opf.href.attr & opf.hreflang.attr? & opf.rel.attr & opf.id.attr? & opf.refines.attr? & opf.media-type.attr? & opf.properties.attr? }         
       
    opf.property.attr = attribute property { datatype.property }
    opf.rel.attr = attribute rel { datatype.properties }
+   opf.hreflang.attr = attribute hreflang { "" | datatype.string.nonempty }
    opf.scheme.attr = attribute scheme { datatype.property }
    opf.refines.attr = attribute refines { datatype.URI }
    
diff --git a/src/test/resources/epub3/files/package-document/link-hreflang-empty-valid.opf b/src/test/resources/epub3/files/package-document/link-hreflang-empty-valid.opf
new file mode 100644
index 000000000..57b80e736
--- /dev/null
+++ b/src/test/resources/epub3/files/package-document/link-hreflang-empty-valid.opf
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<package xmlns="http://www.idpf.org/2007/opf" version="3.0" unique-identifier="uid"
+    xmlns:dc="http://purl.org/dc/elements/1.1/">
+    <metadata>
+        <dc:title>Title</dc:title>
+        <dc:language>en</dc:language>
+        <dc:identifier id="uid">NOID</dc:identifier>
+        <meta property="dcterms:modified">2019-01-01T12:00:00Z</meta>
+        <link hreflang="" rel="alternate" href="https://example.org/package.json" media-type="application/json-ld"/>
+    </metadata>
+    <manifest>
+        <item id="t001" href="contents.xhtml" properties="nav" media-type="application/xhtml+xml"/>
+    </manifest>
+    <spine>
+        <itemref idref="t001"/>
+    </spine>
+</package>
diff --git a/src/test/resources/epub3/files/package-document/link-hreflang-valid.opf b/src/test/resources/epub3/files/package-document/link-hreflang-valid.opf
new file mode 100644
index 000000000..298175a5a
--- /dev/null
+++ b/src/test/resources/epub3/files/package-document/link-hreflang-valid.opf
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<package xmlns="http://www.idpf.org/2007/opf" version="3.0" unique-identifier="uid"
+    xmlns:dc="http://purl.org/dc/elements/1.1/">
+    <metadata>
+        <dc:title>Title</dc:title>
+        <dc:language>en</dc:language>
+        <dc:identifier id="uid">NOID</dc:identifier>
+        <meta property="dcterms:modified">2019-01-01T12:00:00Z</meta>
+        <link hreflang="en-US" rel="alternate" href="https://example.org/package.json" media-type="application/json-ld"/>
+    </metadata>
+    <manifest>
+        <item id="t001" href="contents.xhtml" properties="nav" media-type="application/xhtml+xml"/>
+    </manifest>
+    <spine>
+        <itemref idref="t001"/>
+    </spine>
+</package>
diff --git a/src/test/resources/epub3/package-document.feature b/src/test/resources/epub3/package-document.feature
index 5467d2fe0..cefa142c5 100644
--- a/src/test/resources/epub3/package-document.feature
+++ b/src/test/resources/epub3/package-document.feature
@@ -237,6 +237,14 @@ Feature: EPUB 3 ▸ Packages ▸ Package Document Checks
     When checking file 'link-to-publication-resource-error.opf'
     Then error OPF-067 is reported
     And no other errors or warnings are reported
+
+  Scenario: the 'link' element can have an 'hreflang' attribute
+    When checking file 'link-hreflang-valid.opf'
+    Then no other errors or warnings are reported
+
+  Scenario: the 'link' 'hreflang' attribute can be empty
+    When checking file 'link-hreflang-empty-valid.opf'
+    Then no other errors or warnings are reported
   
   ### 3.4.4 Manifest