diff --git a/high_level_layer.go b/high_level_layer.go
index a27220e..d1844d7 100644
--- a/high_level_layer.go
+++ b/high_level_layer.go
@@ -6,6 +6,7 @@ package python3
 */
 import "C"
 import (
+	"fmt"
 	"unsafe"
 )