diff --git a/src/swe-glib.c b/src/swe-glib.c
index b87b03d..dd5b740 100644
--- a/src/swe-glib.c
+++ b/src/swe-glib.c
@@ -235,3 +235,25 @@ gswe_planet_info_free(GswePlanetInfo *planet_info)
 }
 
 G_DEFINE_BOXED_TYPE(GswePlanetInfo, gswe_planet_info, (GBoxedCopyFunc)gswe_planet_info_copy, (GBoxedFreeFunc)gswe_planet_info_free);
+
+static GsweSignInfo *
+gswe_sign_info_copy(GsweSignInfo *sign_info)
+{
+    GsweSignInfo *ret = g_new0(GsweSignInfo, 1);
+
+    ret->sign_id = sign_info->sign_id;
+    ret->name = g_strdup(sign_info->name);
+    ret->element = sign_info->element;
+    ret->quality = sign_info->quality;
+
+    return ret;
+}
+
+static void
+gswe_sign_info_free(GsweSignInfo *sign_info)
+{
+    g_free(sign_info->name);
+    g_free(sign_info);
+}
+
+G_DEFINE_BOXED_TYPE(GsweSignInfo, gswe_sign_info, (GBoxedCopyFunc)gswe_sign_info_copy, (GBoxedFreeFunc)gswe_sign_info_free);
diff --git a/src/swe-glib.h b/src/swe-glib.h
index 872c6be..b5d8598 100644
--- a/src/swe-glib.h
+++ b/src/swe-glib.h
@@ -36,5 +36,8 @@ void gswe_init();
 GType gswe_planet_info_get_type(void);
 #define GSWE_TYPE_PLANET_INFO (gswe_planet_info_get_type())
 
+GType gswe_sign_info_get_type(void);
+#define GSWE_TYPE_SIGN_INFO (gswe_sign_info_get_type())
+
 #endif /* __SWE_GLIB_H__ */