diff --git a/gst/gstmemory.h b/gst/gstmemory.h
index 5d6edecddf..f498de8e8f 100644
--- a/gst/gstmemory.h
+++ b/gst/gstmemory.h
@@ -351,13 +351,13 @@ void           gst_memory_resize       (GstMemory *mem, gssize offset, gsize siz
 #define        gst_memory_make_writable(m) GST_MEMORY_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (m)))
 
 /* retrieving data */
-GstMemory *    gst_memory_make_mapped  (GstMemory *mem, GstMapInfo *info, GstMapFlags flags);
+GstMemory *    gst_memory_make_mapped  (GstMemory *mem, GstMapInfo *info, GstMapFlags flags) G_GNUC_WARN_UNUSED_RESULT;
 gboolean       gst_memory_map          (GstMemory *mem, GstMapInfo *info, GstMapFlags flags);
 void           gst_memory_unmap        (GstMemory *mem, GstMapInfo *info);
 
 /* copy and subregions */
-GstMemory *    gst_memory_copy         (GstMemory *mem, gssize offset, gssize size);
-GstMemory *    gst_memory_share        (GstMemory *mem, gssize offset, gssize size);
+GstMemory *    gst_memory_copy         (GstMemory *mem, gssize offset, gssize size) G_GNUC_WARN_UNUSED_RESULT;
+GstMemory *    gst_memory_share        (GstMemory *mem, gssize offset, gssize size) G_GNUC_WARN_UNUSED_RESULT;
 
 /* span memory */
 gboolean       gst_memory_is_span      (GstMemory *mem1, GstMemory *mem2, gsize *offset);
diff --git a/gst/gstminiobject.h b/gst/gstminiobject.h
index 15556fbce7..bdb2e6107a 100644
--- a/gst/gstminiobject.h
+++ b/gst/gstminiobject.h
@@ -237,10 +237,10 @@ gboolean        gst_mini_object_lock            (GstMiniObject *object, GstLockF
 void            gst_mini_object_unlock          (GstMiniObject *object, GstLockFlags flags);
 
 gboolean        gst_mini_object_is_writable     (const GstMiniObject *mini_object);
-GstMiniObject * gst_mini_object_make_writable	(GstMiniObject *mini_object);
+GstMiniObject * gst_mini_object_make_writable	(GstMiniObject *mini_object) G_GNUC_WARN_UNUSED_RESULT;
 
 /* copy */
-GstMiniObject * gst_mini_object_copy		(const GstMiniObject *mini_object) G_GNUC_MALLOC;
+GstMiniObject * gst_mini_object_copy		(const GstMiniObject *mini_object) G_GNUC_MALLOC G_GNUC_WARN_UNUSED_RESULT;
 
 
 void            gst_mini_object_set_qdata       (GstMiniObject *object, GQuark quark,
@@ -251,7 +251,7 @@ gpointer        gst_mini_object_steal_qdata     (GstMiniObject *object, GQuark q
 
 gboolean        gst_mini_object_replace         (GstMiniObject **olddata, GstMiniObject *newdata);
 gboolean        gst_mini_object_take            (GstMiniObject **olddata, GstMiniObject *newdata);
-GstMiniObject * gst_mini_object_steal           (GstMiniObject **olddata);
+GstMiniObject * gst_mini_object_steal           (GstMiniObject **olddata) G_GNUC_WARN_UNUSED_RESULT;
 
 /**
  * GST_DEFINE_MINI_OBJECT_TYPE:
diff --git a/gst/gsturi.h b/gst/gsturi.h
index 6e1504cef4..7e0f0b3a82 100644
--- a/gst/gsturi.h
+++ b/gst/gsturi.h
@@ -209,11 +209,11 @@ GstUri * gst_uri_from_string_with_base (GstUri * base,
 gboolean gst_uri_equal                 (const GstUri * first,
                                         const GstUri * second);
 GstUri * gst_uri_join                  (GstUri * base_uri,
-                                        GstUri * ref_uri);
+                                        GstUri * ref_uri) G_GNUC_WARN_UNUSED_RESULT;
 gchar *  gst_uri_join_strings          (const gchar * base_uri,
                                         const gchar * ref_uri) G_GNUC_MALLOC;
 gboolean gst_uri_is_writable           (const GstUri * uri);
-GstUri * gst_uri_make_writable         (GstUri * uri);
+GstUri * gst_uri_make_writable         (GstUri * uri) G_GNUC_WARN_UNUSED_RESULT;
 gchar *  gst_uri_to_string             (const GstUri * uri) G_GNUC_MALLOC;
 gboolean gst_uri_is_normalized         (const GstUri * uri);
 gboolean gst_uri_normalize             (GstUri * uri);