diff --git a/pkgs/servers/mail/dovecot/plugins/fts_xapian/default.nix b/pkgs/servers/mail/dovecot/plugins/fts_xapian/default.nix
index 1ae541cdf8ac..e6ec00633386 100644
--- a/pkgs/servers/mail/dovecot/plugins/fts_xapian/default.nix
+++ b/pkgs/servers/mail/dovecot/plugins/fts_xapian/default.nix
@@ -1,13 +1,13 @@
 { lib, stdenv, fetchFromGitHub, autoconf, automake, sqlite, pkg-config, dovecot, libtool, xapian, icu64 }:
 stdenv.mkDerivation rec {
   pname = "dovecot-fts-xapian";
-  version = "1.5.4";
+  version = "1.5.4b";
 
   src = fetchFromGitHub {
     owner = "grosjo";
     repo = "fts-xapian";
     rev = version;
-    sha256 = "sha256-3vrcaBsarJNECwfzUOrUnjD555E2dgbFiiEJR5bN3qM=";
+    sha256 = "sha256-RzwJjcUgk1XXQZpNdz86Pr9HsUaQCOSt5oSejnGVmgA=";
   };
 
   buildInputs = [ dovecot xapian icu64 sqlite ];