diff --git a/providers/mime/mime.go b/providers/mime/mime.go
index 4809ccc..ffdf80c 100644
--- a/providers/mime/mime.go
+++ b/providers/mime/mime.go
@@ -15,12 +15,26 @@ type Provider struct {
 
 // FuncMap fulfills the step.FuncProvider interface.
 func (this *Provider) FuncMap () template.FuncMap {
+	return nil
+}
+
+// FuncMapFor fulfills the step.FuncProviderFor interface.
+func (this *Provider) FuncMapFor (document *step.Document) template.FuncMap {
+	stat := &state {
+		document: document,
+	}
 	return template.FuncMap {
-		"fileContentType": funcFileContentType,
+		"fileContentType": stat.funcFileContentType,
 	}
 }
 
-func funcFileContentType (name string) (string, error) {
+type state struct {
+	document *step.Document
+}
+
+func (this *state) funcFileContentType (name string) (string, error) {
+	name, err := this.document.Rel(name)
+	if err != nil { return "", err }
 	typ, err := mimetype.DetectFile(name)
 	if err != nil { return "", err }
 	return typ.String(), err