diff --git a/pkgs/tools/networking/offlineimap/default.nix b/pkgs/tools/networking/offlineimap/default.nix
index 1b1aa768a25f..a5b46ebbc3c6 100644
--- a/pkgs/tools/networking/offlineimap/default.nix
+++ b/pkgs/tools/networking/offlineimap/default.nix
@@ -3,6 +3,7 @@
 buildPythonPackage rec {
   version = "6.5.5-rc2";
   name = "offlineimap-${version}";
+  namePrefix = "";
 
   src = fetchurl {
     url = "https://github.com/OfflineIMAP/offlineimap/tarball/v${version}";