diff --git a/src/gswe-types.c b/src/gswe-types.c
index af7524b..92803c5 100644
--- a/src/gswe-types.c
+++ b/src/gswe-types.c
@@ -76,3 +76,18 @@ gswe_aspect_data_copy(GsweAspectData *aspect_data)
 
 G_DEFINE_BOXED_TYPE(GsweAspectData, gswe_aspect_data, (GBoxedCopyFunc)gswe_aspect_data_copy, (GBoxedFreeFunc)g_free);
 
+static GsweAntiscionData *
+gswe_antiscion_data_copy(GsweAntiscionData *antiscion_data)
+{
+    GsweAntiscionData *ret = g_new0(GsweAntiscionData, 1);
+
+    ret->planet1 = antiscion_data->planet1;
+    ret->planet2 = antiscion_data->planet2;
+    ret->axis = antiscion_data->axis;
+    ret->antiscion_info = antiscion_data->antiscion_info;
+    ret->difference = antiscion_data->difference;
+
+    return ret;
+}
+
+G_DEFINE_BOXED_TYPE(GsweAntiscionData, gswe_antiscion_data, (GBoxedCopyFunc)gswe_antiscion_data_copy, (GBoxedFreeFunc)g_free);
diff --git a/src/gswe-types.h b/src/gswe-types.h
index 1fa9a48..9efcd1a 100644
--- a/src/gswe-types.h
+++ b/src/gswe-types.h
@@ -425,5 +425,8 @@ typedef struct {
     gdouble difference;
 } GsweAntiscionData;
 
+GType gswe_antiscion_data_get_type(void);
+#define GSWE_TYPE_ANTISCION_DATA (gswe_antiscion_data_get_type())
+
 #endif /* __SWE_GLIB_GSWE_PLANETS_H__ */