diff --git a/src/core/gcal-range-tree.h b/src/core/gcal-range-tree.h
index 0f31cd0d..86f37e1c 100644
--- a/src/core/gcal-range-tree.h
+++ b/src/core/gcal-range-tree.h
@@ -46,7 +46,7 @@ typedef gboolean    (*GcalRangeTraverseFunc)                     (GcalRange
 #define GCAL_TRAVERSE_CONTINUE FALSE;
 #define GCAL_TRAVERSE_STOP     TRUE;
 
-GType                gcal_range_tree_get_type                    (void) G_GNUC_CONST;
+GType                gcal_range_tree_get_type                    (void);
 
 GcalRangeTree*       gcal_range_tree_new                         (void);
 
diff --git a/src/core/gcal-range.h b/src/core/gcal-range.h
index 3c1b8373..87789cb2 100644
--- a/src/core/gcal-range.h
+++ b/src/core/gcal-range.h
@@ -78,7 +78,7 @@ typedef enum
   GCAL_RANGE_DATE_ONLY,
 } GcalRangeType;
 
-GType                gcal_range_get_type                         (void) G_GNUC_CONST;
+GType                gcal_range_get_type                         (void);
 
 GcalRange*           gcal_range_new                              (GDateTime          *range_start,
                                                                   GDateTime          *range_end,
diff --git a/src/core/gcal-recurrence.h b/src/core/gcal-recurrence.h
index 3a10332a..946b9712 100644
--- a/src/core/gcal-recurrence.h
+++ b/src/core/gcal-recurrence.h
@@ -69,7 +69,7 @@ struct _GcalRecurrence
 
 };
 
-GType                gcal_recurrence_get_type                    (void) G_GNUC_CONST;
+GType                gcal_recurrence_get_type                    (void);
 
 GcalRecurrence*      gcal_recurrence_new                         (void);