diff --git a/nixos/modules/services/web-servers/jboss/default.nix b/nixos/modules/services/web-servers/jboss/default.nix
index ca5b8635fc00..d243e0f3f1b7 100644
--- a/nixos/modules/services/web-servers/jboss/default.nix
+++ b/nixos/modules/services/web-servers/jboss/default.nix
@@ -31,32 +31,38 @@ in
 
       tempDir = mkOption {
         default = "/tmp";
+        type = types.str;
         description = "Location where JBoss stores its temp files";
       };
 
       logDir = mkOption {
         default = "/var/log/jboss";
+        type = types.str;
         description = "Location of the logfile directory of JBoss";
       };
 
       serverDir = mkOption {
         description = "Location of the server instance files";
         default = "/var/jboss/server";
+        type = types.str;
       };
 
       deployDir = mkOption {
         description = "Location of the deployment files";
         default = "/nix/var/nix/profiles/default/server/default/deploy/";
+        type = types.str;
       };
 
       libUrl = mkOption {
         default = "file:///nix/var/nix/profiles/default/server/default/lib";
         description = "Location where the shared library JARs are stored";
+        type = types.str;
       };
 
       user = mkOption {
         default = "nobody";
         description = "User account under which jboss runs.";
+        type = types.str;
       };
 
       useJK = mkOption {