diff --git a/src/swe-glib.h b/src/swe-glib.h
index 8eb1372..b9f4645 100644
--- a/src/swe-glib.h
+++ b/src/swe-glib.h
@@ -5,6 +5,8 @@
 #include "gswe-types.h"
 #include "gswe-timestamp.h"
 
+extern GHashTable *gswe_planet_info_table;
+
 void gswe_init(gchar *sweph_path);
 
 #endif /* __SWE_GLIB_H__ */