diff --git a/src/libsysprof-analyze/sysprof-document-frame-private.h b/src/libsysprof-analyze/sysprof-document-frame-private.h
index 82ad8e2e..e10aaee2 100644
--- a/src/libsysprof-analyze/sysprof-document-frame-private.h
+++ b/src/libsysprof-analyze/sysprof-document-frame-private.h
@@ -31,10 +31,10 @@ struct _SysprofDocumentFrame
   GObject                    parent;
   GMappedFile               *mapped_file;
   const SysprofCaptureFrame *frame;
+  gint64                     time_offset;
   guint32                    frame_len : 16;
   guint32                    needs_swap : 1;
   guint32                    padding : 15;
-  guint32                    time_offset;
 };
 
 struct _SysprofDocumentFrameClass
diff --git a/src/libsysprof-analyze/sysprof-document-frame.c b/src/libsysprof-analyze/sysprof-document-frame.c
index 4221de6d..014bfd51 100644
--- a/src/libsysprof-analyze/sysprof-document-frame.c
+++ b/src/libsysprof-analyze/sysprof-document-frame.c
@@ -147,7 +147,6 @@ _sysprof_document_frame_new (GMappedFile               *mapped_file,
                              gint64                     end_time)
 {
   SysprofDocumentFrame *self;
-  gint64 time_offset;
   GType gtype;
 
   switch (frame->type)
@@ -220,10 +219,7 @@ _sysprof_document_frame_new (GMappedFile               *mapped_file,
   self->frame_len = frame_len;
   self->needs_swap = !!needs_swap;
 
-  time_offset = CLAMP (sysprof_document_frame_get_time (self) - begin_time, 0, G_MAXINT64);
-
-  /* loose precision here after about 71 minutes */
-  self->time_offset = (guint)time_offset;
+  self->time_offset = CLAMP (sysprof_document_frame_get_time (self) - begin_time, 0, G_MAXINT64);
 
   return self;
 }