diff --git a/draw2dpdf/test_test.go b/draw2dpdf/test_test.go
index 923f021..a763c59 100644
--- a/draw2dpdf/test_test.go
+++ b/draw2dpdf/test_test.go
@@ -11,12 +11,14 @@ import (
 	"github.com/llgcode/draw2d/draw2dpdf"
 )
 
-func test(t *testing.T, sample draw2d.Sample) {
+type sample func(gc draw2d.GraphicContext, ext string) (string, error)
+
+func test(t *testing.T, draw sample) {
 	// Initialize the graphic context on an pdf document
 	dest := draw2dpdf.NewPdf("L", "mm", "A4")
 	gc := draw2dpdf.NewGraphicContext(dest)
 	// Draw sample
-	fn, err := sample(gc, "pdf")
+	fn, err := draw(gc, "pdf")
 	if err != nil {
 		t.Errorf("Drawing %q failed: %v", fn, err)
 		return
diff --git a/gc.go b/gc.go
index 8248cdc..66dc508 100644
--- a/gc.go
+++ b/gc.go
@@ -15,8 +15,6 @@ const (
 	FillRuleWinding
 )
 
-type Sample func(gc GraphicContext, ext string) (string, error)
-
 type GraphicContext interface {
 	Path
 	// Create a new path
diff --git a/test_test.go b/test_test.go
index 33cbfac..ca58f79 100644
--- a/test_test.go
+++ b/test_test.go
@@ -9,7 +9,9 @@ import (
 	"github.com/llgcode/draw2d"
 )
 
-func test(t *testing.T, draw draw2d.Sample) {
+type sample func(gc draw2d.GraphicContext, ext string) (string, error)
+
+func test(t *testing.T, draw sample) {
 	// Initialize the graphic context on an RGBA image
 	dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
 	gc := draw2d.NewGraphicContext(dest)