diff --git a/examples/TemplateChecker.php b/examples/TemplateChecker.php
index 52df42f4f..7a7220c5d 100644
--- a/examples/TemplateChecker.php
+++ b/examples/TemplateChecker.php
@@ -96,12 +96,22 @@ class TemplateAnalyzer extends Psalm\Internal\Analyzer\FileAnalyzer
 
         $constructor_id = $class . '::__construct';
 
-        $this->project_analyzer->getMethodMutations($constructor_id, $this_context);
+        $this->project_analyzer->getMethodMutations(
+            $constructor_id,
+            $this_context,
+            $this->getRootFilePath(),
+            $this->getRootFileName()
+        );
 
         $this_context->vars_in_scope['$this'] = new Type\Union([new Type\Atomic\TNamedObject($class)]);
 
         // check the actual method
-        $this->project_analyzer->getMethodMutations($method_id, $this_context);
+        $this->project_analyzer->getMethodMutations(
+            $method_id,
+            $this_context,
+            $this->getRootFilePath(),
+            $this->getRootFileName()
+        );
 
         $view_context = new Context();
         $view_context->self = self::VIEW_CLASS;
diff --git a/src/Psalm/Internal/Analyzer/FileAnalyzer.php b/src/Psalm/Internal/Analyzer/FileAnalyzer.php
index b843842e0..75be3230b 100644
--- a/src/Psalm/Internal/Analyzer/FileAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/FileAnalyzer.php
@@ -277,7 +277,12 @@ class FileAnalyzer extends SourceAnalyzer implements StatementsSource
             $class_analyzer_to_examine = $this->class_analyzers_to_analyze[strtolower($fq_class_name)];
         } else {
             if (!$from_project_analyzer) {
-                $this->project_analyzer->getMethodMutations($method_id, $this_context);
+                $this->project_analyzer->getMethodMutations(
+                    $method_id,
+                    $this_context,
+                    $this->getRootFilePath(),
+                    $this->getRootFileName()
+                );
             }
 
             return;
diff --git a/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php b/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php
index 4cdc4a1b0..ca9861b38 100644
--- a/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php
@@ -810,12 +810,18 @@ class ProjectAnalyzer
      *
      * @return void
      */
-    public function getMethodMutations($original_method_id, Context $this_context)
-    {
+    public function getMethodMutations(
+        $original_method_id,
+        Context $this_context,
+        string $root_file_path,
+        string $root_file_name
+    ) {
         list($fq_class_name) = explode('::', $original_method_id);
 
         $file_analyzer = $this->getFileAnalyzerForClassLike($fq_class_name);
 
+        $file_analyzer->setRootFilePath($root_file_path, $root_file_name);
+
         $appearing_method_id = $this->codebase->methods->getAppearingMethodId($original_method_id);
 
         if (!$appearing_method_id) {
diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/CallAnalyzer.php b/src/Psalm/Internal/Analyzer/Statements/Expression/CallAnalyzer.php
index 6736d69c3..de3ab4ad7 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/CallAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/CallAnalyzer.php
@@ -88,7 +88,12 @@ class CallAnalyzer
                     $context->initialized_methods[$method_id] = true;
                 }
 
-                $project_analyzer->getMethodMutations($method_id, $context);
+                $project_analyzer->getMethodMutations(
+                    $method_id,
+                    $context,
+                    $source->getRootFilePath(),
+                    $source->getRootFileName()
+                );
             }
         } elseif ($context->collect_initializations &&
             $context->self &&
@@ -186,7 +191,12 @@ class CallAnalyzer
 
                     $old_self = $context->self;
                     $context->self = $declaring_fq_class_name;
-                    $project_analyzer->getMethodMutations($declaring_method_id, $context);
+                    $project_analyzer->getMethodMutations(
+                        $declaring_method_id,
+                        $context,
+                        $source->getRootFilePath(),
+                        $source->getRootFileName()
+                    );
                     $context->self = $old_self;
                 }
 
diff --git a/tests/IncludeTest.php b/tests/IncludeTest.php
index cffbf938c..d108f18ef 100644
--- a/tests/IncludeTest.php
+++ b/tests/IncludeTest.php
@@ -491,6 +491,54 @@ class IncludeTest extends TestCase
                 'hoist_constants' => false,
                 'error_levels' => ['DuplicateClass', 'MissingPropertyType'],
             ],
+            'functionsDefined' => [
+                'files' => [
+                    getcwd() . DIRECTORY_SEPARATOR . 'index.php' => '<?php
+                        include "func.php";
+                        include "Base.php";
+                        include "Child.php";',
+                    getcwd() . DIRECTORY_SEPARATOR . 'func.php' => '<?php
+                        namespace ns;
+
+                        function func(): void {}
+
+                        define("ns\\cons", 0);
+
+                        cons;',
+                    getcwd() . DIRECTORY_SEPARATOR . 'Base.php' => '<?php
+                        namespace ns;
+
+                        func();
+
+                        cons;
+
+                        class Base {
+                            public function __construct() {}
+                        }',
+                    getcwd() . DIRECTORY_SEPARATOR . 'Child.php' => '<?php
+                        namespace ns;
+
+                        func();
+
+                        cons;
+
+                        class Child extends Base {
+                            /**
+                             * @var int
+                             */
+                            public $x;
+
+                            public function __construct() {
+                                parent::__construct();
+
+                                $this->x = 5;
+                            }
+                        }',
+                ],
+                'files_to_check' => [
+                    getcwd() . DIRECTORY_SEPARATOR . 'index.php',
+                ],
+            ],
         ];
     }
 
diff --git a/tests/MethodMutationTest.php b/tests/MethodMutationTest.php
index 342c79f40..50db896fa 100644
--- a/tests/MethodMutationTest.php
+++ b/tests/MethodMutationTest.php
@@ -93,7 +93,12 @@ class MethodMutationTest extends TestCase
         $this->project_analyzer->getCodebase()->scanFiles();
         $method_context = new Context();
         $method_context->collect_mutations = true;
-        $this->project_analyzer->getMethodMutations('FooController::barBar', $method_context);
+        $this->project_analyzer->getMethodMutations(
+            'FooController::barBar',
+            $method_context,
+            'somefile.php',
+            'somefile.php'
+        );
 
         $this->assertSame('UserViewData', (string)$method_context->vars_in_scope['$this->user_viewdata']);
         $this->assertSame('string', (string)$method_context->vars_in_scope['$this->user_viewdata->name']);
@@ -131,7 +136,12 @@ class MethodMutationTest extends TestCase
         $this->project_analyzer->getCodebase()->scanFiles();
         $method_context = new Context();
         $method_context->collect_mutations = true;
-        $this->project_analyzer->getMethodMutations('FooController::__construct', $method_context);
+        $this->project_analyzer->getMethodMutations(
+            'FooController::__construct',
+            $method_context,
+            'somefile.php',
+            'somefile.php'
+        );
 
         $this->assertSame('Foo', (string)$method_context->vars_in_scope['$this->foo']);
     }
@@ -168,7 +178,12 @@ class MethodMutationTest extends TestCase
         $this->project_analyzer->getCodebase()->scanFiles();
         $method_context = new Context();
         $method_context->collect_mutations = true;
-        $this->project_analyzer->getMethodMutations('FooController::__construct', $method_context);
+        $this->project_analyzer->getMethodMutations(
+            'FooController::__construct',
+            $method_context,
+            'somefile.php',
+            'somefile.php'
+        );
 
         $this->assertSame('Foo', (string)$method_context->vars_in_scope['$this->foo']);
     }