diff --git a/src/analysis/outline.ml b/src/analysis/outline.ml
index 8f8566f56..ec44f989a 100644
--- a/src/analysis/outline.ml
+++ b/src/analysis/outline.ml
@@ -179,20 +179,18 @@ and get_mod_children ~include_types node =
 
 and remove_mod_indir ~include_types node =
   match node.t_node with
-  | Module_expr _ | Module_type _ ->
-    List.concat_map
-      (Lazy.force node.t_children)
-      ~f:(remove_mod_indir ~include_types)
+  | Module_expr _ | Module_type _ -> get_mod_children ~include_types node
   | _ -> remove_top_indir ~include_types node
 
 and remove_top_indir ~include_types t =
   match t.t_node with
-  | Structure _ | Signature _ ->
-    List.concat_map
-      ~f:(remove_top_indir ~include_types)
-      (Lazy.force t.t_children)
+  | Structure _ | Signature _ -> get_mod_children ~include_types t
   | Signature_item _ | Structure_item _ ->
-    List.filter_map (Lazy.force t.t_children) ~f:(summarize ~include_types)
+    List.concat_map (Lazy.force t.t_children) ~f:(fun child ->
+        match child.t_node with
+        | Include_declaration _ | Include_description _ ->
+          get_mod_children ~include_types child
+        | _ -> summarize ~include_types child |> Option.to_list)
   | _ -> []
 
 let get ~include_types browses =
diff --git a/tests/test-dirs/outline.t/foo.ml b/tests/test-dirs/outline.t/foo.ml
index cd2624174..dbf70103b 100644
--- a/tests/test-dirs/outline.t/foo.ml
+++ b/tests/test-dirs/outline.t/foo.ml
@@ -26,3 +26,23 @@ type 'a point =
   ; y : 'a
   ; z : 'a
   }
+
+include struct
+  type t
+  let x = 1
+  include struct
+    type u
+    let y = "y"
+  end
+end
+
+module type S = sig
+  include sig
+    type t
+    val x : int
+    include sig
+      type u
+      val y : string
+    end
+  end
+end
diff --git a/tests/test-dirs/outline.t/run.t b/tests/test-dirs/outline.t/run.t
index d46613e7b..10e44e8a2 100644
--- a/tests/test-dirs/outline.t/run.t
+++ b/tests/test-dirs/outline.t/run.t
@@ -3,6 +3,142 @@
   {
     "class": "return",
     "value": [
+      {
+        "start": {
+          "line": 39,
+          "col": 0
+        },
+        "end": {
+          "line": 48,
+          "col": 3
+        },
+        "name": "S",
+        "kind": "Signature",
+        "type": null,
+        "children": [
+          {
+            "start": {
+              "line": 45,
+              "col": 6
+            },
+            "end": {
+              "line": 45,
+              "col": 20
+            },
+            "name": "y",
+            "kind": "Value",
+            "type": "string",
+            "children": [],
+            "deprecated": false
+          },
+          {
+            "start": {
+              "line": 44,
+              "col": 6
+            },
+            "end": {
+              "line": 44,
+              "col": 12
+            },
+            "name": "u",
+            "kind": "Type",
+            "type": null,
+            "children": [],
+            "deprecated": false
+          },
+          {
+            "start": {
+              "line": 42,
+              "col": 4
+            },
+            "end": {
+              "line": 42,
+              "col": 15
+            },
+            "name": "x",
+            "kind": "Value",
+            "type": "int",
+            "children": [],
+            "deprecated": false
+          },
+          {
+            "start": {
+              "line": 41,
+              "col": 4
+            },
+            "end": {
+              "line": 41,
+              "col": 10
+            },
+            "name": "t",
+            "kind": "Type",
+            "type": null,
+            "children": [],
+            "deprecated": false
+          }
+        ],
+        "deprecated": false
+      },
+      {
+        "start": {
+          "line": 35,
+          "col": 4
+        },
+        "end": {
+          "line": 35,
+          "col": 15
+        },
+        "name": "y",
+        "kind": "Value",
+        "type": "string",
+        "children": [],
+        "deprecated": false
+      },
+      {
+        "start": {
+          "line": 34,
+          "col": 4
+        },
+        "end": {
+          "line": 34,
+          "col": 10
+        },
+        "name": "u",
+        "kind": "Type",
+        "type": null,
+        "children": [],
+        "deprecated": false
+      },
+      {
+        "start": {
+          "line": 32,
+          "col": 2
+        },
+        "end": {
+          "line": 32,
+          "col": 11
+        },
+        "name": "x",
+        "kind": "Value",
+        "type": "int",
+        "children": [],
+        "deprecated": false
+      },
+      {
+        "start": {
+          "line": 31,
+          "col": 2
+        },
+        "end": {
+          "line": 31,
+          "col": 8
+        },
+        "name": "t",
+        "kind": "Type",
+        "type": null,
+        "children": [],
+        "deprecated": false
+      },
       {
         "start": {
           "line": 24,
@@ -261,3 +397,12 @@ Check that when we pass "-include-types false", every "type" is null.
   null
   null
   null
+  null
+  null
+  null
+  null
+  null
+  null
+  null
+  null
+  null