diff --git a/src/tef/writer.ml b/src/tef/writer.ml
index e84b4d8..85d9bbe 100644
--- a/src/tef/writer.ml
+++ b/src/tef/writer.ml
@@ -1,5 +1,3 @@
-open Common_
-
 let char = Buffer.add_char
 let raw_string = Buffer.add_string