diff --git a/cover.go b/cover.go
index 76fc6c4..876f7a8 100644
--- a/cover.go
+++ b/cover.go
@@ -1,5 +1,9 @@
 package main
 
+import _ "image/png"
+import _ "image/jpeg"
+import _ "image/gif"
+
 import (
 	"bytes"
 	"git.gitorious.org/go-pkg/epubgo.git"
diff --git a/tools/togridfs/cover.go b/tools/togridfs/cover.go
index 87d6934..f135790 100644
--- a/tools/togridfs/cover.go
+++ b/tools/togridfs/cover.go
@@ -1,5 +1,9 @@
 package main
 
+import _ "image/png"
+import _ "image/jpeg"
+import _ "image/gif"
+
 import (
 	"bytes"
 	"git.gitorious.org/go-pkg/epubgo.git"