diff --git a/gobject/gobject.h b/gobject/gobject.h
index a2f9af3d8..522011fe3 100644
--- a/gobject/gobject.h
+++ b/gobject/gobject.h
@@ -62,7 +62,11 @@ G_BEGIN_DECLS
  * 
  * Checks whether a valid #GTypeInstance pointer is of type %G_TYPE_OBJECT.
  */
+#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_42
 #define G_IS_OBJECT(object)         (G_TYPE_CHECK_INSTANCE_FUNDAMENTAL_TYPE ((object), G_TYPE_OBJECT))
+#else
+#define G_IS_OBJECT(object)         (G_TYPE_CHECK_INSTANCE_TYPE ((object), G_TYPE_OBJECT))
+#endif
 /**
  * G_IS_OBJECT_CLASS:
  * @class: a #GObjectClass
diff --git a/gobject/gparam.h b/gobject/gparam.h
index 8f216e4ce..7f77ca821 100644
--- a/gobject/gparam.h
+++ b/gobject/gparam.h
@@ -50,7 +50,11 @@ G_BEGIN_DECLS
  * Checks whether @pspec "is a" valid #GParamSpec structure of type %G_TYPE_PARAM
  * or derived.
  */
+#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_42
 #define G_IS_PARAM_SPEC(pspec)		(G_TYPE_CHECK_INSTANCE_FUNDAMENTAL_TYPE ((pspec), G_TYPE_PARAM))
+#else
+#define G_IS_PARAM_SPEC(pspec)		(G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM))
+#endif
 /**
  * G_PARAM_SPEC_CLASS:
  * @pclass: a valid #GParamSpecClass