diff --git a/packages/block-library/src/separator/block.json b/packages/block-library/src/separator/block.json
index 926d978b7e4d59..30d10dc6596aca 100644
--- a/packages/block-library/src/separator/block.json
+++ b/packages/block-library/src/separator/block.json
@@ -36,6 +36,18 @@
 		},
 		"interactivity": {
 			"clientNavigation": true
+		},
+		"__experimentalBorder": {
+			"radius": true,
+			"color": true,
+			"width": true,
+			"style": true,
+			"__experimentalDefaultControls": {
+				"radius": true,
+				"color": true,
+				"width": true,
+				"style": true
+			}
 		}
 	},
 	"styles": [