diff --git a/plug-ins/common/animation-optimize.c b/plug-ins/common/animation-optimize.c
index 952911d0ab..a4cc256558 100644
--- a/plug-ins/common/animation-optimize.c
+++ b/plug-ins/common/animation-optimize.c
@@ -1142,6 +1142,7 @@ do_optimizations (GimpRunMode  run_mode,
               gimp_item_set_name (GIMP_ITEM (last_true_frame), newlayer_name);
 
               g_free (newlayer_name);
+              g_free (oldlayer_name);
             }
           else
             {