diff --git a/src/Path/PointerUtil.php b/src/Path/PointerUtil.php
index 1062f6d..cb8accb 100644
--- a/src/Path/PointerUtil.php
+++ b/src/Path/PointerUtil.php
@@ -37,14 +37,22 @@ public static function getSchemaPointers($path, $isURIFragmentId = false)
             $parts = explode(':', $item);
             if (isset($parts[0])) {
                 $schemaPaths = explode('[', $parts[0], 2);
+                if (isset($schemaPaths[1])) {
+                    $schemaPaths[1] = substr(strtr($schemaPaths[1], array('~1' => '~', '~2' => ':')), 0, -1);
+                }
+
                 if ($schemaPaths[0] === Schema::PROP_REF) {
                     $result[] = $pointer . '/' . JsonPointer::escapeSegment(Schema::PROP_REF, $isURIFragmentId);
-                    $pointer = self::rebuildPointer(substr($schemaPaths[1], 0, -1), $isURIFragmentId);
+                    if (strpos($schemaPaths[1], '://')) {
+                        $pointer = $schemaPaths[1];
+                    } else {
+                        $pointer = self::rebuildPointer($schemaPaths[1], $isURIFragmentId);
+                    }
                     continue;
                 }
                 $pointer .= '/' . JsonPointer::escapeSegment($schemaPaths[0], $isURIFragmentId);
                 if (isset($schemaPaths[1])) {
-                    $pointer .= '/' . JsonPointer::escapeSegment(substr($schemaPaths[1], 0, -1), $isURIFragmentId);
+                    $pointer .= '/' . JsonPointer::escapeSegment($schemaPaths[1], $isURIFragmentId);
                 } elseif ($parts[1]) {
                     $pointer .= '/' . JsonPointer::escapeSegment($parts[1], $isURIFragmentId);
                 }
diff --git a/src/Schema.php b/src/Schema.php
index 5a16f22..29091d6 100644
--- a/src/Schema.php
+++ b/src/Schema.php
@@ -815,7 +815,7 @@ private function processObject($data, Context $options, $path, $result = null)
                     if (preg_match(Helper::toPregPattern($pattern), $key)) {
                         $found = true;
                         $value = self::unboolSchema($propertySchema)->process($value, $options,
-                            $path . '->patternProperties[' . $pattern . ']:' . $key);
+                            $path . '->patternProperties[' . strtr($pattern, array('~' => '~1', ':' => '~2')) . ']:' . $key);
                         if (!$options->validateOnly && $import) {
                             $result->addPatternPropertyName($pattern, $key);
                         }
@@ -988,7 +988,7 @@ public function process($data, Context $options, $path = '#', $result = null)
         $import = $options->import;
 
         if ($ref = $this->getFromRef()) {
-            $path .= '->$ref[' . $ref . ']';
+            $path .= '->$ref[' . strtr($ref, array('~' => '~1', ':' => '~2')) . ']';
         }
 
         if (!$import && $data instanceof ObjectItemContract) {
diff --git a/tests/src/PHPUnit/Ref/FileResolverTest.php b/tests/src/PHPUnit/Ref/FileResolverTest.php
new file mode 100644
index 0000000..30ff76b
--- /dev/null
+++ b/tests/src/PHPUnit/Ref/FileResolverTest.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace Swaggest\JsonSchema\Tests\PHPUnit\Ref;
+
+
+use Swaggest\JsonSchema\Context;
+use Swaggest\JsonSchema\InvalidValue;
+use Swaggest\JsonSchema\RemoteRef\Preloaded;
+use Swaggest\JsonSchema\Schema;
+
+class FileResolverTest extends \PHPUnit_Framework_TestCase
+{
+    public function testFileResolver()
+    {
+        $refProvider = new Preloaded();
+        $refProvider->setSchemaData(
+            'file://baseTypes.json',
+            json_decode(<<<'JSON'
+{
+  "stringFromOutside": {
+    "type": "string"
+  }
+}
+JSON
+)
+        );
+
+        $schemaData = json_decode(<<<'JSON'
+{
+    "$schema": "http://json-schema.org/schema#",
+    "type": "object",
+    "properties": {
+        "sample": { "$ref": "file://baseTypes.json#/stringFromOutside" }
+    },
+    "required": ["sample"],
+    "additionalProperties": false
+}
+JSON
+);
+        $options = new Context();
+        $options->remoteRefProvider = $refProvider;
+        $schema = Schema::import($schemaData, $options);
+
+        $schema->in(json_decode('{"sample": "some-string"}')); // no exception for string
+        try {
+            $schema->in(json_decode('{"sample": 1}')); // exception for int
+            $this->fail('Exception expected');
+        } catch (InvalidValue $exception) {
+            $expected = <<<'TEXT'
+Swaggest\JsonSchema\Exception\Error Object
+(
+    [error] => String expected, 1 received
+    [schemaPointers] => Array
+        (
+            [0] => /properties/sample/$ref
+            [1] => file://baseTypes.json#/stringFromOutside
+        )
+
+    [dataPointer] => /sample
+    [processingPath] => #->properties:sample->$ref[file~2//baseTypes.json#/stringFromOutside]
+    [subErrors] => 
+)
+
+TEXT;
+
+            $this->assertSame($expected, print_r($exception->inspect(), 1));
+        }
+    }
+
+}
\ No newline at end of file