diff --git a/tests/draft-next/optional/format/duration.json b/tests/draft-next/optional/format/duration.json
index c890b5d6..d5adca20 100644
--- a/tests/draft-next/optional/format/duration.json
+++ b/tests/draft-next/optional/format/duration.json
@@ -125,6 +125,11 @@
                 "description": "invalid non-ASCII '২' (a Bengali 2)",
                 "data": "P২Y",
                 "valid": false
+            },
+            {
+                "description": "element without unit",
+                "data": "P1",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2019-09/optional/format/duration.json b/tests/draft2019-09/optional/format/duration.json
index 0f8acb71..00d5f47a 100644
--- a/tests/draft2019-09/optional/format/duration.json
+++ b/tests/draft2019-09/optional/format/duration.json
@@ -125,6 +125,11 @@
                 "description": "invalid non-ASCII '২' (a Bengali 2)",
                 "data": "P২Y",
                 "valid": false
+            },
+            {
+                "description": "element without unit",
+                "data": "P1",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2020-12/optional/format/duration.json b/tests/draft2020-12/optional/format/duration.json
index 18fccd3d..a3af56ef 100644
--- a/tests/draft2020-12/optional/format/duration.json
+++ b/tests/draft2020-12/optional/format/duration.json
@@ -125,6 +125,11 @@
                 "description": "invalid non-ASCII '২' (a Bengali 2)",
                 "data": "P২Y",
                 "valid": false
+            },
+            {
+                "description": "element without unit",
+                "data": "P1",
+                "valid": false
             }
         ]
     }