diff --git a/CHANGELOG.md b/CHANGELOG.md
index a2ead2c3..a5ed5d1a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -78,6 +78,8 @@ All notable changes to this project will be documented in this file, in reverse
 
 - [#40](https://github.com/webimpress/coding-standard/pull/40) fixes `PHP\RedundantSemicolon` sniff to remove redundant semicolon after colon and goto label 
 
+- [#55](https://github.com/webimpress/coding-standard/pull/55) fixes `Namespaces\AlphabeticallySortedUses` sniff to work with files without namespaces
+
 ## 1.0.5 - 2019-10-06
 
 ### Added
diff --git a/src/WebimpressCodingStandard/Sniffs/Namespaces/AlphabeticallySortedUsesSniff.php b/src/WebimpressCodingStandard/Sniffs/Namespaces/AlphabeticallySortedUsesSniff.php
index 51ac62da..ca8f5af5 100644
--- a/src/WebimpressCodingStandard/Sniffs/Namespaces/AlphabeticallySortedUsesSniff.php
+++ b/src/WebimpressCodingStandard/Sniffs/Namespaces/AlphabeticallySortedUsesSniff.php
@@ -20,6 +20,7 @@
 
 use const T_NAMESPACE;
 use const T_NS_SEPARATOR;
+use const T_OPEN_TAG;
 use const T_SEMICOLON;
 use const T_STRING;
 use const T_USE;
@@ -31,17 +32,26 @@ class AlphabeticallySortedUsesSniff implements Sniff
      */
     public function register() : array
     {
-        return [T_NAMESPACE];
+        return [T_OPEN_TAG, T_NAMESPACE];
     }
 
     /**
      * @param int $stackPtr
+     * @return int
      */
     public function process(File $phpcsFile, $stackPtr)
     {
-        $uses = $this->getUseStatements($phpcsFile, $stackPtr);
         $tokens = $phpcsFile->getTokens();
 
+        if ($tokens[$stackPtr]['code'] === T_OPEN_TAG) {
+            $namespace = $phpcsFile->findNext(T_NAMESPACE, $stackPtr + 1);
+            if ($namespace) {
+                return $namespace;
+            }
+        }
+
+        $uses = $this->getUseStatements($phpcsFile, $stackPtr);
+
         $lastUse = null;
         foreach ($uses as $use) {
             if (! $lastUse) {
@@ -61,7 +71,7 @@ public function process(File $phpcsFile, $stackPtr)
                     $this->fixAlphabeticalOrder($phpcsFile, $uses);
                 }
 
-                return;
+                return $stackPtr + 1;
             }
 
             // Check empty lines between use statements.
@@ -130,6 +140,10 @@ public function process(File $phpcsFile, $stackPtr)
 
             $lastUse = $use;
         }
+
+        return $tokens[$stackPtr]['code'] === T_OPEN_TAG
+            ? $phpcsFile->numTokens + 1
+            : $stackPtr + 1;
     }
 
     /**
diff --git a/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.2.inc b/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.2.inc
new file mode 100644
index 00000000..fb192fb9
--- /dev/null
+++ b/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.2.inc
@@ -0,0 +1,31 @@
+<?php
+
+use const D;
+use const C;
+use B;
+use A;
+use function Y;
+use function X;
+use A\TagManager;
+use A\Tag;
+use A\Tag\Tags;
+use C\Response as MyResponse;
+use C\Response\HtmlResponse;
+
+class J {
+    use MyTrait;
+
+    public function closure($foo)
+    {
+        return function ($x) use ($foo) {
+            return $x <=> $foo;
+        };
+    }
+
+    public function anonym()
+    {
+        return new class() {
+            use AnotherTrait;
+        };
+    }
+}
diff --git a/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.2.inc.fixed b/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.2.inc.fixed
new file mode 100644
index 00000000..4224c3ad
--- /dev/null
+++ b/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.2.inc.fixed
@@ -0,0 +1,33 @@
+<?php
+
+use A;
+use A\Tag;
+use A\Tag\Tags;
+use A\TagManager;
+use B;
+use C\Response as MyResponse;
+use C\Response\HtmlResponse;
+
+use function X;
+use function Y;
+
+use const C;
+use const D;
+
+class J {
+    use MyTrait;
+
+    public function closure($foo)
+    {
+        return function ($x) use ($foo) {
+            return $x <=> $foo;
+        };
+    }
+
+    public function anonym()
+    {
+        return new class() {
+            use AnotherTrait;
+        };
+    }
+}
diff --git a/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.php b/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.php
index d26d1daf..b3c1b021 100644
--- a/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.php
+++ b/test/Sniffs/Namespaces/AlphabeticallySortedUsesUnitTest.php
@@ -15,6 +15,10 @@ protected function getErrorList(string $testFile = '') : array
                 return [
                     6 => 1,
                 ];
+            case 'AlphabeticallySortedUsesUnitTest.2.inc':
+                return [
+                    4 => 1,
+                ];
         }
 
         return [