diff --git a/src/Utils/removeUnreachable.ts b/src/Utils/removeUnreachable.ts
index 430ccb1ed..479c99d89 100644
--- a/src/Utils/removeUnreachable.ts
+++ b/src/Utils/removeUnreachable.ts
@@ -39,7 +39,7 @@ function addReachable(
         }
     } else if (definition.not) {
         addReachable(definition.not, definitions, reachable);
-    } else if (definition.type === "object") {
+    } else if (definition.type?.includes("object")) {
         for (const prop in definition.properties || {}) {
             const propDefinition = definition.properties![prop];
             addReachable(propDefinition, definitions, reachable);
@@ -49,7 +49,7 @@ function addReachable(
         if (additionalProperties) {
             addReachable(additionalProperties, definitions, reachable);
         }
-    } else if (definition.type === "array") {
+    } else if (definition.type?.includes("array")) {
         const items = definition.items;
         if (Array.isArray(items)) {
             for (const item of items) {
diff --git a/test/valid-data-annotations.test.ts b/test/valid-data-annotations.test.ts
index 4cead7918..ffa9e1ba1 100644
--- a/test/valid-data-annotations.test.ts
+++ b/test/valid-data-annotations.test.ts
@@ -73,4 +73,6 @@ describe("valid-data-annotations", () => {
     it("annotation-writeOnly", assertValidSchema("annotation-writeOnly", "MyObject", "basic"));
 
     it("annotation-union-if-then", assertValidSchema("annotation-union-if-then", "Animal", "basic"));
+
+    it("annotation-nullable-definition", assertValidSchema("annotation-nullable-definition", "MyObject", "extended"));
 });
diff --git a/test/valid-data/annotation-nullable-definition/main.ts b/test/valid-data/annotation-nullable-definition/main.ts
new file mode 100644
index 000000000..b78627f98
--- /dev/null
+++ b/test/valid-data/annotation-nullable-definition/main.ts
@@ -0,0 +1,10 @@
+export class Definition {
+     name: string
+}
+
+export class MyObject  {
+    /**
+     * @nullable
+     */
+    optional?: Definition[]
+}
diff --git a/test/valid-data/annotation-nullable-definition/schema.json b/test/valid-data/annotation-nullable-definition/schema.json
new file mode 100644
index 000000000..217292f05
--- /dev/null
+++ b/test/valid-data/annotation-nullable-definition/schema.json
@@ -0,0 +1,33 @@
+{
+  "$schema":"http://json-schema.org/draft-07/schema#",
+  "$ref":"#/definitions/MyObject",
+  "definitions":{
+     "MyObject":{
+        "type":"object",
+        "properties":{
+           "optional":{
+              "type":[
+                 "array",
+                 "null"
+              ],
+              "items":{
+                 "$ref":"#/definitions/Definition"
+              }
+           }
+        },
+        "additionalProperties":false
+     },
+     "Definition":{
+        "type":"object",
+        "properties":{
+           "name":{
+              "type":"string"
+           }
+        },
+        "required":[
+           "name"
+        ],
+        "additionalProperties":false
+     }
+  }
+}
diff --git a/yarn.lock b/yarn.lock
index 8aa2b9d7c..765d8db68 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1115,10 +1115,10 @@
     minimatch "^3.1.2"
     strip-json-comments "^3.1.1"
 
-"@humanwhocodes/config-array@^0.10.4":
-  version "0.10.4"
-  resolved "https://registry.yarnpkg.com/@humanwhocodes/config-array/-/config-array-0.10.4.tgz#01e7366e57d2ad104feea63e72248f22015c520c"
-  integrity sha512-mXAIHxZT3Vcpg83opl1wGlVZ9xydbfZO3r5YfRSH6Gpp2J/PfdBP0wbDa2sO6/qRbcalpoevVyW6A/fI6LfeMw==
+"@humanwhocodes/config-array@^0.10.5":
+  version "0.10.5"
+  resolved "https://registry.yarnpkg.com/@humanwhocodes/config-array/-/config-array-0.10.5.tgz#bb679745224745fff1e9a41961c1d45a49f81c04"
+  integrity sha512-XVVDtp+dVvRxMoxSiSfasYaG02VEe1qH5cKgMQJWhol6HwzbcqoCMJi8dAGoYAO57jhUyhI6cWuRiTcRaDaYug==
   dependencies:
     "@humanwhocodes/object-schema" "^1.2.1"
     debug "^4.1.1"
@@ -1697,9 +1697,9 @@
   integrity sha512-jhuKLIRrhvCPLqwPcx6INqmKeiA5EWrsCOPhrlFSrbrmU4ZMPjj5Ul/oLCMDO98XRUIwVm78xICz4EPCektzeQ==
 
 "@types/node@*", "@types/node@^18.7.18":
-  version "18.7.18"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-18.7.18.tgz#633184f55c322e4fb08612307c274ee6d5ed3154"
-  integrity sha512-m+6nTEOadJZuTPkKR/SYK3A2d7FZrgElol9UP1Kae90VVU4a6mxnPuLiIW1m4Cq4gZ/nWb9GrdVXJCoCazDAbg==
+  version "18.7.20"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-18.7.20.tgz#d9442de7b5cb166476340b4271b15300fe058a39"
+  integrity sha512-adzY4vLLr5Uivmx8+zfSJ5fbdgKxX8UMtjtl+17n0B1q1Nz8JEmE151vefMdpD+1gyh+77weN4qEhej/O7budQ==
 
 "@types/normalize-package-data@^2.4.0":
   version "2.4.1"
@@ -2876,12 +2876,12 @@ eslint-visitor-keys@^3.3.0:
   integrity sha512-mQ+suqKJVyeuwGYHAdjMFqjCyfl8+Ldnxuyp3ldiMBFKkvytrXUZWaiPCEav8qDHKty44bD+qV1IP4T+w+xXRA==
 
 eslint@^8.23.1:
-  version "8.23.1"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-8.23.1.tgz#cfd7b3f7fdd07db8d16b4ac0516a29c8d8dca5dc"
-  integrity sha512-w7C1IXCc6fNqjpuYd0yPlcTKKmHlHHktRkzmBPZ+7cvNBQuiNjx0xaMTjAJGCafJhQkrFJooREv0CtrVzmHwqg==
+  version "8.24.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-8.24.0.tgz#489516c927a5da11b3979dbfb2679394523383c8"
+  integrity sha512-dWFaPhGhTAiPcCgm3f6LI2MBWbogMnTJzFBbhXVRQDJPkr9pGZvVjlVfXd+vyDcWPA2Ic9L2AXPIQM0+vk/cSQ==
   dependencies:
     "@eslint/eslintrc" "^1.3.2"
-    "@humanwhocodes/config-array" "^0.10.4"
+    "@humanwhocodes/config-array" "^0.10.5"
     "@humanwhocodes/gitignore-to-minimatch" "^1.0.2"
     "@humanwhocodes/module-importer" "^1.0.1"
     ajv "^6.10.0"