diff --git a/libfprint/fpi-image.h b/libfprint/fpi-image.h
index 3554bb7b..0ae19f9f 100644
--- a/libfprint/fpi-image.h
+++ b/libfprint/fpi-image.h
@@ -68,6 +68,8 @@ struct _FpImage
 
   GPtrArray *minutiae;
   guint      ref_count;
+
+  gpointer   _padding_dummy[32];
 };
 
 gint fpi_std_sq_dev (const guint8 *buf,