diff --git a/src/SpecBaseObject.php b/src/SpecBaseObject.php
index 4ae45395..29f70b42 100644
--- a/src/SpecBaseObject.php
+++ b/src/SpecBaseObject.php
@@ -484,4 +484,22 @@ public function getDocumentPosition(): ?JsonPointer
     {
         return $this->_jsonPointer;
     }
+
+    /**
+     * Returns extension properties with `x-` prefix.
+     * @see https://github.com/OAI/OpenAPI-Specification/blob/3.0.2/versions/3.0.2.md#specificationExtensions
+     * @return array<string, mixed>
+     * @since 1.5.3
+     */
+    public function getExtensions(): array
+    {
+        $extensions = [];
+        foreach ($this->_properties as $propertyKey => $extension) {
+            if (strpos($propertyKey, 'x-') !== 0) {
+                continue;
+            }
+            $extensions[$propertyKey] = $extension;
+        }
+        return $extensions;
+    }
 }
diff --git a/src/spec/PathItem.php b/src/spec/PathItem.php
index db6b105e..4b2debcd 100644
--- a/src/spec/PathItem.php
+++ b/src/spec/PathItem.php
@@ -190,6 +190,12 @@ public function resolveReferences(ReferenceContext $context = null)
                     }
                 }
             }
+
+            if ($pathItem instanceof SpecBaseObject) {
+                foreach ($pathItem->getExtensions() as $extensionKey => $extension) {
+                    $this->{$extensionKey} = $extension;
+                }
+            }
         }
         parent::resolveReferences($context);
     }
diff --git a/tests/spec/PathTest.php b/tests/spec/PathTest.php
index cf50b19d..6c46e4b0 100644
--- a/tests/spec/PathTest.php
+++ b/tests/spec/PathTest.php
@@ -137,7 +137,7 @@ public function testInvalidPath()
     public function testPathItemReference()
     {
         $file = __DIR__ . '/data/paths/openapi.yaml';
-        /** @var $openapi OpenApi */
+        /** @var $openapi \cebe\openapi\spec\OpenApi */
         $openapi = Reader::readFromYamlFile($file, \cebe\openapi\spec\OpenApi::class, false);
 
         $result = $openapi->validate();
@@ -147,6 +147,10 @@ public function testPathItemReference()
         $this->assertInstanceOf(Paths::class, $openapi->paths);
         $this->assertInstanceOf(PathItem::class, $fooPath = $openapi->paths['/foo']);
         $this->assertInstanceOf(PathItem::class, $barPath = $openapi->paths['/bar']);
+        $this->assertSame([
+            'x-extension-1' => 'Extension1',
+            'x-extension-2' => 'Extension2'
+        ], $openapi->getExtensions());
 
         $this->assertEmpty($fooPath->getOperations());
         $this->assertEmpty($barPath->getOperations());
diff --git a/tests/spec/ReferenceTest.php b/tests/spec/ReferenceTest.php
index 4448da32..b94c946e 100644
--- a/tests/spec/ReferenceTest.php
+++ b/tests/spec/ReferenceTest.php
@@ -504,6 +504,23 @@ public function testReferencedCommonParamsInReferencedPath()
           enum:
             - test
           type: string
+    x-something: something
+  /something:
+    get:
+      responses:
+        '200':
+          description: 'OK if common params can be references'
+    parameters:
+      -
+        name: test
+        in: header
+        description: 'Test parameter to be referenced'
+        required: true
+        schema:
+          enum:
+            - test
+          type: string
+    x-something: something
 
 YAML;
         // remove line endings to make string equal on windows
diff --git a/tests/spec/data/paths/openapi.yaml b/tests/spec/data/paths/openapi.yaml
index 1dedca4b..a96831de 100644
--- a/tests/spec/data/paths/openapi.yaml
+++ b/tests/spec/data/paths/openapi.yaml
@@ -3,6 +3,10 @@ openapi: 3.0.2
 info:
   title: My API
   version: 1.0.0
+x-extension-1: Extension1
+x-extension-2: Extension2
+X-EXTENSION: Invalid because of Uppercase X-
+xyz-extension: invalid extension
 paths:
   /foo:
     $ref: 'path-items.yaml#/~1foo'
diff --git a/tests/spec/data/reference/ReferencedCommonParamsInReferencedPath.yml b/tests/spec/data/reference/ReferencedCommonParamsInReferencedPath.yml
index 68b6b86b..7a7c4aa2 100644
--- a/tests/spec/data/reference/ReferencedCommonParamsInReferencedPath.yml
+++ b/tests/spec/data/reference/ReferencedCommonParamsInReferencedPath.yml
@@ -5,3 +5,11 @@ info:
 paths:
   /example:
     $ref: 'paths/ReferencesCommonParams.yml'
+  /something:
+    parameters:
+      - $ref: './parameters/TestParameter.yml'
+    x-something: something
+    get:
+      responses:
+        200:
+          description: OK if common params can be references
diff --git a/tests/spec/data/reference/paths/ReferencesCommonParams.yml b/tests/spec/data/reference/paths/ReferencesCommonParams.yml
index 5513a537..2fb096f5 100644
--- a/tests/spec/data/reference/paths/ReferencesCommonParams.yml
+++ b/tests/spec/data/reference/paths/ReferencesCommonParams.yml
@@ -1,6 +1,7 @@
 parameters:
   - $ref: '../parameters/TestParameter.yml'
 
+x-something: something
 get:
   responses:
     200: