diff --git a/modules/gitit/default.nix b/modules/gitit/default.nix
index 0149c08..776f72e 100644
--- a/modules/gitit/default.nix
+++ b/modules/gitit/default.nix
@@ -23,6 +23,7 @@ let
     access-question: ${access-question}
     access-question-answers: ${access-question-answers}
     max-upload-size: ${toString max-upload-size}K
+    session-timeout: ${toString session-timeout}
   '';
 
 in
@@ -61,6 +62,13 @@ in
         and the _upload url becoming inactive.
       '';
     };
+    session-timeout = mkOption {
+      type = lib.types.int;
+      default = 60;
+      description = ''
+        Number of minutes of inactivity before a session expires
+      '';
+    };
     access-question = mkOption {
       type = lib.types.str;
       default = "";