diff --git a/model/enclosure.go b/model/enclosure.go
index 5a52f781..6de1af73 100644
--- a/model/enclosure.go
+++ b/model/enclosure.go
@@ -11,7 +11,7 @@ type Enclosure struct {
 	EntryID  int64  `json:"entry_id"`
 	URL      string `json:"url"`
 	MimeType string `json:"mime_type"`
-	Size     int    `json:"size"`
+	Size     int64  `json:"size"`
 }
 
 // EnclosureList represents a list of attachments.
diff --git a/reader/atom/atom.go b/reader/atom/atom.go
index 46971259..96a429fb 100644
--- a/reader/atom/atom.go
+++ b/reader/atom/atom.go
@@ -187,7 +187,7 @@ func getEnclosures(a *atomEntry) model.EnclosureList {
 
 	for _, link := range a.Links {
 		if strings.ToLower(link.Rel) == "enclosure" {
-			length, _ := strconv.Atoi(link.Length)
+			length, _ := strconv.ParseInt(link.Length, 10, 0)
 			enclosures = append(enclosures, &model.Enclosure{URL: link.URL, MimeType: link.Type, Size: length})
 		}
 	}
diff --git a/reader/json/json.go b/reader/json/json.go
index 81b38f6b..2c812abf 100644
--- a/reader/json/json.go
+++ b/reader/json/json.go
@@ -47,7 +47,7 @@ type jsonAttachment struct {
 	URL      string `json:"url"`
 	MimeType string `json:"mime_type"`
 	Title    string `json:"title"`
-	Size     int    `json:"size_in_bytes"`
+	Size     int64  `json:"size_in_bytes"`
 	Duration int    `json:"duration_in_seconds"`
 }
 
diff --git a/reader/rss/rss.go b/reader/rss/rss.go
index b7fc1d0f..041cd198 100644
--- a/reader/rss/rss.go
+++ b/reader/rss/rss.go
@@ -194,7 +194,7 @@ func (r *rssItem) GetEnclosures() model.EnclosureList {
 	enclosures := make(model.EnclosureList, 0)
 
 	for _, enclosure := range r.Enclosures {
-		length, _ := strconv.Atoi(enclosure.Length)
+		length, _ := strconv.ParseInt(enclosure.Length, 10, 0)
 		enclosureURL := enclosure.URL
 
 		if r.OrigEnclosureLink != "" {
diff --git a/sql/schema_version_15.sql b/sql/schema_version_15.sql
new file mode 100644
index 00000000..b5cb3862
--- /dev/null
+++ b/sql/schema_version_15.sql
@@ -0,0 +1 @@
+alter table enclosures alter column size set data type bigint;
\ No newline at end of file
diff --git a/sql/sql.go b/sql/sql.go
index 80be63ff..f6aa19ed 100644
--- a/sql/sql.go
+++ b/sql/sql.go
@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2018-02-24 17:47:34.98646993 +0000 GMT
+// 2018-03-14 19:16:10.293618552 -0700 PDT m=+0.003182755
 
 package sql
 
@@ -129,6 +129,7 @@ create index feeds_user_category_idx on feeds(user_id, category_id);
 	"schema_version_14": `alter table integrations add column nunux_keeper_enabled bool default 'f';
 alter table integrations add column nunux_keeper_url text default '';
 alter table integrations add column nunux_keeper_api_key text default '';`,
+	"schema_version_15": `alter table enclosures alter column size set data type bigint;`,
 	"schema_version_2": `create extension if not exists hstore;
 alter table users add column extra hstore;
 create index users_extra_idx on users using gin(extra);
@@ -174,6 +175,7 @@ var SqlMapChecksums = map[string]string{
 	"schema_version_12": "a95abab6cdf64811fc744abd37457e2928939d999c5ef00d2bdd9398e16f32fb",
 	"schema_version_13": "9073fae1e796936f4a43a8120ebdb4218442fe7d346ace6387556a357c2d7edf",
 	"schema_version_14": "4622e42c4a5a88b6fe1e61f3d367b295968f7260ab5b96481760775ba9f9e1fe",
+	"schema_version_15": "13ff91462bdf4cda5a94a4c7a09f757761b0f2c32b4be713ba4786a4837750e4",
 	"schema_version_2":  "e8e9ff32478df04fcddad10a34cba2e8bb1e67e7977b5bd6cdc4c31ec94282b4",
 	"schema_version_3":  "a54745dbc1c51c000f74d4e5068f1e2f43e83309f023415b1749a47d5c1e0f12",
 	"schema_version_4":  "216ea3a7d3e1704e40c797b5dc47456517c27dbb6ca98bf88812f4f63d74b5d9",
diff --git a/storage/migration.go b/storage/migration.go
index ed219ded..9d6316af 100644
--- a/storage/migration.go
+++ b/storage/migration.go
@@ -12,7 +12,7 @@ import (
 	"github.com/miniflux/miniflux/sql"
 )
 
-const schemaVersion = 14
+const schemaVersion = 15
 
 // Migrate run database migrations.
 func (s *Storage) Migrate() {