diff --git a/source/blender/makesrna/intern/rna_object.c b/source/blender/makesrna/intern/rna_object.c
index fc0631c7043..4a6f6e2f15e 100644
--- a/source/blender/makesrna/intern/rna_object.c
+++ b/source/blender/makesrna/intern/rna_object.c
@@ -3242,6 +3242,7 @@ static void rna_def_object(BlenderRNA *brna)
 
   prop = RNA_def_property(srna, "active_material_index", PROP_INT, PROP_UNSIGNED);
   RNA_def_property_int_sdna(prop, NULL, "actcol");
+  RNA_def_property_flag(prop, PROP_NO_DEG_UPDATE);
   RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
   RNA_def_property_int_funcs(prop,
                              "rna_Object_active_material_index_get",