diff --git a/src/Psalm/Checker/Statements/Block/ForeachChecker.php b/src/Psalm/Checker/Statements/Block/ForeachChecker.php
index f5f17d271..ef49d8849 100644
--- a/src/Psalm/Checker/Statements/Block/ForeachChecker.php
+++ b/src/Psalm/Checker/Statements/Block/ForeachChecker.php
@@ -5,6 +5,7 @@ use PhpParser;
 use Psalm\Checker\ClassChecker;
 use Psalm\Checker\ClassLikeChecker;
 use Psalm\Checker\CommentChecker;
+use Psalm\Checker\InterfaceChecker;
 use Psalm\Checker\MethodChecker;
 use Psalm\Checker\Statements\Expression\AssignmentChecker;
 use Psalm\Checker\Statements\ExpressionChecker;
@@ -178,7 +179,15 @@ class ForeachChecker
                         $project_checker,
                         $iterator_type->value,
                         'Iterator'
-                    )) {
+                    ) ||
+                        (InterfaceChecker::interfaceExists($project_checker, $iterator_type->value)
+                            && InterfaceChecker::interfaceExtends(
+                                $project_checker,
+                                $iterator_type->value,
+                                'Iterator'
+                            )
+                        )
+                    ) {
                         $iterator_method = $iterator_type->value . '::current';
                         $iterator_class_type = MethodChecker::getMethodReturnType($project_checker, $iterator_method);
 
@@ -202,11 +211,20 @@ class ForeachChecker
                         $project_checker,
                         $iterator_type->value,
                         'Traversable'
-                    )) {
+                    ) ||
+                        (InterfaceChecker::interfaceExists($project_checker, $iterator_type->value)
+                            && InterfaceChecker::interfaceExtends(
+                                $project_checker,
+                                $iterator_type->value,
+                                'Traversable'
+                            )
+                        )
+                    ) {
                         // @todo try and get value type
                     } elseif (!in_array(
                         strtolower($iterator_type->value),
-                        ['iterator', 'iterable', 'traversable'], true
+                        ['iterator', 'iterable', 'traversable'],
+                        true
                     )) {
                         if (IssueBuffer::accepts(
                             new RawObjectIteration(
diff --git a/tests/ForeachTest.php b/tests/ForeachTest.php
index 72a6fb448..5556e4cc5 100644
--- a/tests/ForeachTest.php
+++ b/tests/ForeachTest.php
@@ -4,6 +4,43 @@ namespace Psalm\Tests;
 class ForeachTest extends TestCase
 {
     use Traits\FileCheckerInvalidCodeParseTestTrait;
+    use Traits\FileCheckerValidCodeParseTestTrait;
+
+    /**
+     * @return array
+     */
+    public function providerFileCheckerValidCodeParse()
+    {
+        return [
+            'iteratorAggregateIteration' => [
+                '<?php
+                    class C implements IteratorAggregate
+                    {
+                        public function getIterator(): Iterator
+                        {
+                            return new ArrayIterator([]);
+                        }
+                    }
+
+                    function loopT(Traversable $coll): void
+                    {
+                        foreach ($coll as $item) {}
+                    }
+
+                    function loopI(IteratorAggregate $coll): void
+                    {
+                        foreach ($coll as $item) {}
+                    }
+
+                    loopT(new C);
+                    loopI(new C);',
+                'assignments' => [],
+                'error_levels' => [
+                    'MixedAssignment', 'UndefinedThisPropertyAssignment',
+                ],
+            ],
+        ];
+    }
 
     /**
      * @return array