diff --git a/src/UsedSymbolExtractor.php b/src/UsedSymbolExtractor.php
index cff49c6..371bc61 100644
--- a/src/UsedSymbolExtractor.php
+++ b/src/UsedSymbolExtractor.php
@@ -411,6 +411,7 @@ private function canBeSymbolName(
             || $tokenBeforeName[0] === T_AS
             || $tokenBeforeName[0] === T_FUNCTION
             || $tokenBeforeName[0] === T_OBJECT_OPERATOR
+            || $tokenBeforeName[0] === T_NAMESPACE
             || $tokenBeforeName[0] === (PHP_VERSION_ID > 80000 ? T_NULLSAFE_OBJECT_OPERATOR : -1)
             || $tokenAfterName[0] === T_INSTEADOF
             || $tokenAfterName[0] === T_AS
diff --git a/tests/UsedSymbolExtractorTest.php b/tests/UsedSymbolExtractorTest.php
index 16dc5a0..bc6e397 100644
--- a/tests/UsedSymbolExtractorTest.php
+++ b/tests/UsedSymbolExtractorTest.php
@@ -12,9 +12,10 @@ class UsedSymbolExtractorTest extends TestCase
 
     /**
      * @param array<SymbolKind::*, array<string, list<int>>> $expectedUsages
+     * @param array<string, SymbolKind::*> $extensionSymbols
      * @dataProvider provideVariants
      */
-    public function test(string $path, array $expectedUsages): void
+    public function test(string $path, array $expectedUsages, array $extensionSymbols = []): void
     {
         $code = file_get_contents($path);
         self::assertNotFalse($code);
@@ -23,24 +24,12 @@ public function test(string $path, array $expectedUsages): void
 
         self::assertSame(
             $expectedUsages,
-            $extractor->parseUsedSymbols(
-                [
-                    strtolower('XMLReader') => SymbolKind::CLASSLIKE,
-                    strtolower('PDO') => SymbolKind::CLASSLIKE,
-                    strtolower('json_encode') => SymbolKind::FUNCTION,
-                    strtolower('DDTrace\active_span') => SymbolKind::FUNCTION,
-                    strtolower('DDTrace\root_span') => SymbolKind::FUNCTION,
-                    strtolower('LIBXML_ERR_FATAL') => SymbolKind::CONSTANT,
-                    strtolower('LIBXML_ERR_ERROR') => SymbolKind::CONSTANT,
-                    strtolower('DDTrace\DBM_PROPAGATION_FULL') => SymbolKind::CONSTANT,
-                    strtolower('DDTrace\Integrations\Exec\proc_get_pid') => SymbolKind::FUNCTION,
-                ]
-            )
+            $extractor->parseUsedSymbols($extensionSymbols)
         );
     }
 
     /**
-     * @return iterable<array{string, array<SymbolKind::*, array<string, list<int>>>}>
+     * @return iterable<array{0: string, 1: array<SymbolKind::*, array<string, list<int>>>, 2?: array<string, SymbolKind::*>}>
      */
     public function provideVariants(): iterable
     {
@@ -68,6 +57,9 @@ public function provideVariants(): iterable
         yield 'T_STRING issues' => [
             __DIR__ . '/data/not-autoloaded/used-symbols/t-string-issues.php',
             [],
+            [
+                strtolower('PDO') => SymbolKind::CLASSLIKE,
+            ],
         ];
 
         yield 'various usages' => [
@@ -160,6 +152,7 @@ public function provideVariants(): iterable
                     'CURLOPT_SSL_VERIFYHOST' => [19],
                 ],
             ],
+            self::extensionSymbolsForExtensionsTestCases(),
         ];
 
         yield 'extensions global' => [
@@ -183,6 +176,7 @@ public function provideVariants(): iterable
                     'CURLOPT_SSL_VERIFYHOST' => [19],
                 ],
             ],
+            self::extensionSymbolsForExtensionsTestCases(),
         ];
 
         if (PHP_VERSION_ID >= 80000) {
@@ -206,4 +200,22 @@ public function provideVariants(): iterable
         }
     }
 
+    /**
+     * @return array<string, SymbolKind::*>
+     */
+    private static function extensionSymbolsForExtensionsTestCases(): array
+    {
+        return [
+            strtolower('XMLReader') => SymbolKind::CLASSLIKE,
+            strtolower('PDO') => SymbolKind::CLASSLIKE,
+            strtolower('json_encode') => SymbolKind::FUNCTION,
+            strtolower('DDTrace\active_span') => SymbolKind::FUNCTION,
+            strtolower('DDTrace\root_span') => SymbolKind::FUNCTION,
+            strtolower('LIBXML_ERR_FATAL') => SymbolKind::CONSTANT,
+            strtolower('LIBXML_ERR_ERROR') => SymbolKind::CONSTANT,
+            strtolower('DDTrace\DBM_PROPAGATION_FULL') => SymbolKind::CONSTANT,
+            strtolower('DDTrace\Integrations\Exec\proc_get_pid') => SymbolKind::FUNCTION,
+        ];
+    }
+
 }
diff --git a/tests/data/not-autoloaded/used-symbols/t-string-issues.php b/tests/data/not-autoloaded/used-symbols/t-string-issues.php
index 69c8705..68c1595 100644
--- a/tests/data/not-autoloaded/used-symbols/t-string-issues.php
+++ b/tests/data/not-autoloaded/used-symbols/t-string-issues.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace TString;
+namespace PDO;
 
 use function _; // e.g. https://www.php.net/manual/en/function.-.php
 use function array_filter;