diff --git a/app/core/gimp-memsize.c b/app/core/gimp-memsize.c
index 2c0af86425..86f5d92f38 100644
--- a/app/core/gimp-memsize.c
+++ b/app/core/gimp-memsize.c
@@ -277,6 +277,9 @@ gimp_g_value_get_memsize (GValue *value)
         memsize += gimp_g_object_get_memsize (g_value_get_object (value));
       else if (strcmp ("GimpFont", G_VALUE_TYPE_NAME (value)) == 0)
         memsize += gimp_g_object_get_memsize (g_value_get_object (value));
+      else if (strcmp ("GeglColor", G_VALUE_TYPE_NAME (value)) == 0)
+        /* Internal knowledge of contents of private data. */
+        memsize += sizeof (GeglColor) + sizeof (const Babl *) + 48;
       else
         g_printerr ("%s: unhandled object value type: %s\n",
                     G_STRFUNC, G_VALUE_TYPE_NAME (value));