diff --git a/biscuit-auth/examples/testcases.rs b/biscuit-auth/examples/testcases.rs
index 70266dff..9d06d196 100644
--- a/biscuit-auth/examples/testcases.rs
+++ b/biscuit-auth/examples/testcases.rs
@@ -2158,6 +2158,7 @@ fn typeof_op(target: &str, root: &KeyPair, test: bool) -> TestResult {
         check if [true, false].type() == "set";
         set([true, false]);
         check if set($t), $t.type() == "set";
+        check if null.type() == "null";
         null(null);
         check if null($t), $t.type() == "null";
     "#
diff --git a/biscuit-auth/samples/README.md b/biscuit-auth/samples/README.md
index f5e8b6de..a7c7cf18 100644
--- a/biscuit-auth/samples/README.md
+++ b/biscuit-auth/samples/README.md
@@ -2897,6 +2897,7 @@ check if true.type() == "bool";
 check if bool($t), $t.type() == "bool";
 check if [false, true].type() == "set";
 check if set($t), $t.type() == "set";
+check if null.type() == "null";
 check if null($t), $t.type() == "null";
 ```
 
@@ -2908,7 +2909,7 @@ allow if true;
 ```
 
 revocation ids:
-- `388798e8ccb432572e6eb3dc8d0ca0501245597a44a605209f6f7571cae39f21a55edad33b55c4ec660be18f2141b75e7aabbfc0c7ff6461f12e80e1dc7b4d0a`
+- `1d9153b1a5fd0a5ac4ba0c8c524850c9b94833574643bcfdb072de7a67a759c4bd92ef83710f22775a791409340468f3be00d882f43d837a2aafb10f376a440b`
 
 authorizer world:
 ```
@@ -2948,6 +2949,7 @@ World {
             "check if hex:aa.type() == \"bytes\"",
             "check if integer($t), $t.type() == \"integer\"",
             "check if null($t), $t.type() == \"null\"",
+            "check if null.type() == \"null\"",
             "check if set($t), $t.type() == \"set\"",
             "check if string($t), $t.type() == \"string\"",
             "check if true.type() == \"bool\"",
diff --git a/biscuit-auth/samples/samples.json b/biscuit-auth/samples/samples.json
index e62fa776..10f600e5 100644
--- a/biscuit-auth/samples/samples.json
+++ b/biscuit-auth/samples/samples.json
@@ -2708,7 +2708,7 @@
           ],
           "public_keys": [],
           "external_key": null,
-          "code": "integer(1);\nstring(\"test\");\ndate(2023-12-28T00:00:00Z);\nbytes(hex:aa);\nbool(true);\nset([false, true]);\nnull(null);\ncheck if 1.type() == \"integer\";\ncheck if integer($t), $t.type() == \"integer\";\ncheck if \"test\".type() == \"string\";\ncheck if string($t), $t.type() == \"string\";\ncheck if (2023-12-28T00:00:00Z).type() == \"date\";\ncheck if date($t), $t.type() == \"date\";\ncheck if hex:aa.type() == \"bytes\";\ncheck if bytes($t), $t.type() == \"bytes\";\ncheck if true.type() == \"bool\";\ncheck if bool($t), $t.type() == \"bool\";\ncheck if [false, true].type() == \"set\";\ncheck if set($t), $t.type() == \"set\";\ncheck if null($t), $t.type() == \"null\";\n"
+          "code": "integer(1);\nstring(\"test\");\ndate(2023-12-28T00:00:00Z);\nbytes(hex:aa);\nbool(true);\nset([false, true]);\nnull(null);\ncheck if 1.type() == \"integer\";\ncheck if integer($t), $t.type() == \"integer\";\ncheck if \"test\".type() == \"string\";\ncheck if string($t), $t.type() == \"string\";\ncheck if (2023-12-28T00:00:00Z).type() == \"date\";\ncheck if date($t), $t.type() == \"date\";\ncheck if hex:aa.type() == \"bytes\";\ncheck if bytes($t), $t.type() == \"bytes\";\ncheck if true.type() == \"bool\";\ncheck if bool($t), $t.type() == \"bool\";\ncheck if [false, true].type() == \"set\";\ncheck if set($t), $t.type() == \"set\";\ncheck if null.type() == \"null\";\ncheck if null($t), $t.type() == \"null\";\n"
         }
       ],
       "validations": {
@@ -2745,6 +2745,7 @@
                   "check if hex:aa.type() == \"bytes\"",
                   "check if integer($t), $t.type() == \"integer\"",
                   "check if null($t), $t.type() == \"null\"",
+                  "check if null.type() == \"null\"",
                   "check if set($t), $t.type() == \"set\"",
                   "check if string($t), $t.type() == \"string\"",
                   "check if true.type() == \"bool\""
@@ -2760,7 +2761,7 @@
           },
           "authorizer_code": "allow if true;\n",
           "revocation_ids": [
-            "388798e8ccb432572e6eb3dc8d0ca0501245597a44a605209f6f7571cae39f21a55edad33b55c4ec660be18f2141b75e7aabbfc0c7ff6461f12e80e1dc7b4d0a"
+            "1d9153b1a5fd0a5ac4ba0c8c524850c9b94833574643bcfdb072de7a67a759c4bd92ef83710f22775a791409340468f3be00d882f43d837a2aafb10f376a440b"
           ]
         }
       }
diff --git a/biscuit-auth/samples/test033_typeof.bc b/biscuit-auth/samples/test033_typeof.bc
index 29febd1a..e4f86354 100644
Binary files a/biscuit-auth/samples/test033_typeof.bc and b/biscuit-auth/samples/test033_typeof.bc differ