diff --git a/src/libsysprof-analyze/sysprof-document-private.h b/src/libsysprof-analyze/sysprof-document-private.h
index 1860fe90..6af9bd36 100644
--- a/src/libsysprof-analyze/sysprof-document-private.h
+++ b/src/libsysprof-analyze/sysprof-document-private.h
@@ -24,7 +24,8 @@
 
 G_BEGIN_DECLS
 
-char *_sysprof_document_ref_string (SysprofDocument *self,
-                                    const char      *name);
+gboolean  _sysprof_document_is_native  (SysprofDocument *self);
+char     *_sysprof_document_ref_string (SysprofDocument *self,
+                                        const char      *name);
 
 G_END_DECLS
diff --git a/src/libsysprof-analyze/sysprof-document.c b/src/libsysprof-analyze/sysprof-document.c
index 113ff7e2..d168f9e7 100644
--- a/src/libsysprof-analyze/sysprof-document.c
+++ b/src/libsysprof-analyze/sysprof-document.c
@@ -122,8 +122,8 @@ sysprof_document_init (SysprofDocument *self)
 
 static gboolean
 sysprof_document_load (SysprofDocument  *self,
-                            int                   capture_fd,
-                            GError              **error)
+                       int               capture_fd,
+                       GError          **error)
 {
   goffset pos;
   gsize len;
@@ -326,3 +326,11 @@ sysprof_document_symbolize_finish (SysprofDocument  *self,
 
   return g_task_propagate_pointer (G_TASK (result), error);
 }
+
+gboolean
+_sysprof_document_is_native (SysprofDocument *self)
+{
+  g_return_val_if_fail (SYSPROF_IS_DOCUMENT (self), FALSE);
+
+  return self->needs_swap == FALSE;
+}