diff --git a/entry.go b/entry.go
index 3018e6a..3158adc 100644
--- a/entry.go
+++ b/entry.go
@@ -20,7 +20,7 @@ type Entry struct {
 	Summary      *Text               `xml:"summary,omitempty"`
 	Title        *Text               `xml:"title"`
 	Updated      *Date               `xml:"updated"`
-	Extensions   []*ExtensionElement `xml:",any"`
+	Extensions   []*ExtensionElement `xml:",any,omitempty"`
 }
 
 func (e *Entry) checkAuthors() error {
diff --git a/feed.go b/feed.go
index fe13c8c..b4463fd 100644
--- a/feed.go
+++ b/feed.go
@@ -21,7 +21,7 @@ type Feed struct {
 	Subtitle     *Text               `xml:"subtitle,omitempty"`
 	Title        *Text               `xml:"title"`
 	Updated      *Date               `xml:"updated"`
-	Extensions   []*ExtensionElement `xml:",any"`
+	Extensions   []*ExtensionElement `xml:",any,omitempty"`
 	Entries      []*Entry            `xml:"entry,omitempty"`
 }
 
diff --git a/person.go b/person.go
index a22b18f..4e51be6 100644
--- a/person.go
+++ b/person.go
@@ -10,7 +10,7 @@ type Person struct {
 	Name       string              `xml:"name"`
 	URI        URI                 `xml:"uri,omitempty"`
 	Email      EmailAddress        `xml:"email,omitempty"`
-	Extensions []*ExtensionElement `xml:",any"`
+	Extensions []*ExtensionElement `xml:",any,omitempty"`
 }
 
 func (p *Person) Check() error {
diff --git a/source.go b/source.go
index e1e8e84..1d271cd 100644
--- a/source.go
+++ b/source.go
@@ -16,7 +16,7 @@ type Source struct {
 	Subtitle     *Text               `xml:"subtitle,omitempty"`
 	Title        *Text               `xml:"title,omitempty"`
 	Updated      *Date               `xml:"updated,omitempty"`
-	Extensions   []*ExtensionElement `xml:",any"`
+	Extensions   []*ExtensionElement `xml:",any,omitempty"`
 }
 
 func (s *Source) Check() error {