diff --git a/glib/gslice.h b/glib/gslice.h
index 4b4b9e53e..3efd645dd 100644
--- a/glib/gslice.h
+++ b/glib/gslice.h
@@ -77,8 +77,12 @@ typedef enum {
   G_SLICE_CONFIG_CHUNK_SIZES,
   G_SLICE_CONFIG_CONTENTION_COUNTER
 } GSliceConfig;
+
+GLIB_DEPRECATED_IN_2_34
 void     g_slice_set_config	   (GSliceConfig ckey, gint64 value);
+GLIB_DEPRECATED_IN_2_34
 gint64   g_slice_get_config	   (GSliceConfig ckey);
+GLIB_DEPRECATED_IN_2_34
 gint64*  g_slice_get_config_state  (GSliceConfig ckey, gint64 address, guint *n_values);
 
 G_END_DECLS
diff --git a/glib/tests/slice.c b/glib/tests/slice.c
index 7976e5111..50bbed17c 100644
--- a/glib/tests/slice.c
+++ b/glib/tests/slice.c
@@ -1,5 +1,8 @@
 #include <glib.h>
 
+/* We test deprecated functionality here */
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
 static void
 test_slice_config (void)
 {