diff --git a/dictionaries/CallMap.php b/dictionaries/CallMap.php
index 1ee8284ad..4bdd02151 100644
--- a/dictionaries/CallMap.php
+++ b/dictionaries/CallMap.php
@@ -3313,7 +3313,7 @@ return [
 'flush' => ['void'],
 'fmod' => ['float', 'num1'=>'float', 'num2'=>'float'],
 'fnmatch' => ['bool', 'pattern'=>'string', 'filename'=>'string', 'flags='=>'int'],
-'fopen' => ['resource|false', 'filename'=>'string', 'mode'=>'string', 'use_include_path='=>'bool', 'context='=>'resource'],
+'fopen' => ['resource|false', 'filename'=>'string', 'mode'=>'string', 'use_include_path='=>'bool', 'context='=>'resource|null'],
 'forward_static_call' => ['mixed|false', 'callback'=>'callable', '...args='=>'mixed'],
 'forward_static_call_array' => ['mixed|false', 'callback'=>'callable', 'args'=>'list<mixed>'],
 'fpassthru' => ['int|false', 'stream'=>'resource'],
diff --git a/dictionaries/CallMap_historical.php b/dictionaries/CallMap_historical.php
index 8bd0c75a7..c9748bf16 100644
--- a/dictionaries/CallMap_historical.php
+++ b/dictionaries/CallMap_historical.php
@@ -10878,7 +10878,7 @@ return [
     'flush' => ['void'],
     'fmod' => ['float', 'num1'=>'float', 'num2'=>'float'],
     'fnmatch' => ['bool', 'pattern'=>'string', 'filename'=>'string', 'flags='=>'int'],
-    'fopen' => ['resource|false', 'filename'=>'string', 'mode'=>'string', 'use_include_path='=>'bool', 'context='=>'resource'],
+    'fopen' => ['resource|false', 'filename'=>'string', 'mode'=>'string', 'use_include_path='=>'bool', 'context='=>'resource|null'],
     'forward_static_call' => ['mixed|false', 'callback'=>'callable', '...args='=>'mixed'],
     'forward_static_call_array' => ['mixed|false', 'callback'=>'callable', 'args'=>'list<mixed>'],
     'fpassthru' => ['int|false', 'stream'=>'resource'],