diff --git a/gst/gststructure.c b/gst/gststructure.c
index 23c54b35f5..fe54305c14 100644
--- a/gst/gststructure.c
+++ b/gst/gststructure.c
@@ -2672,7 +2672,7 @@ G_STMT_START {                                                                \
   guint _flags = (flags);                                                     \
   GType _value_type = G_VALUE_TYPE (_value);                                  \
   GTypeValueTable *_vtable = g_type_value_table_peek (_value_type);           \
-  gchar *_lcopy_format = _vtable->lcopy_format;                               \
+  const gchar *_lcopy_format = _vtable->lcopy_format;                         \
   GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, };      \
   guint _n_values = 0;                                                        \
                                                                               \