diff --git a/infer/src/clang/cFrontend_utils.ml b/infer/src/clang/cFrontend_utils.ml
index 364c73d57..ed3efae39 100644
--- a/infer/src/clang/cFrontend_utils.ml
+++ b/infer/src/clang/cFrontend_utils.ml
@@ -499,6 +499,11 @@ struct
         Some (decl_list, impl_decl_info)
     | _ -> None
 
+  let is_in_main_file decl =
+    let decl_info = Clang_ast_proj.get_decl_tuple decl in
+    let file_opt = (fst decl_info.Clang_ast_t.di_source_range).Clang_ast_t.sl_file in
+    opt_equal string_equal file_opt Config.source_file && Option.is_some file_opt
+
 (*
   let rec getter_attribute_opt attributes =
     match attributes with
diff --git a/infer/src/clang/cFrontend_utils.mli b/infer/src/clang/cFrontend_utils.mli
index 1a9fe6c1b..a0c504bbd 100644
--- a/infer/src/clang/cFrontend_utils.mli
+++ b/infer/src/clang/cFrontend_utils.mli
@@ -171,6 +171,11 @@ sig
      Clang_ast_t.obj_c_implementation_decl_info)
       option
 
+  (** Returns true if the declaration or statement is inside the main source
+      file, as opposed to an imported header file. For statements, this refers
+      to the parent decl. *)
+  val is_in_main_file : Clang_ast_t.decl -> bool
+
 end
 
 module General_utils :