diff --git a/source/blender/makesrna/intern/rna_screen.c b/source/blender/makesrna/intern/rna_screen.c
index 5311c80e45d..2471ce3c798 100644
--- a/source/blender/makesrna/intern/rna_screen.c
+++ b/source/blender/makesrna/intern/rna_screen.c
@@ -40,6 +40,7 @@ EnumPropertyItem region_type_items[] = {
 	{RGN_TYPE_TOOLS, "TOOLS", 0, "Tools", ""},
 	{RGN_TYPE_TEMPORARY, "TEMPORARY", 0, "Temporary", ""},
 	{RGN_TYPE_UI, "UI", 0, "UI", ""},
+	{RGN_TYPE_PREVIEW, "PREVIEW", 0, "Preview", ""},
 	{0, NULL, 0, NULL, NULL}};
 
 #ifdef RNA_RUNTIME