diff --git a/packages/block-library/src/spacer/deprecated.js b/packages/block-library/src/spacer/deprecated.js
index 0cf4cddb817ddc..543cd7f248edfa 100644
--- a/packages/block-library/src/spacer/deprecated.js
+++ b/packages/block-library/src/spacer/deprecated.js
@@ -22,6 +22,9 @@ const v2 = {
 		height: {
 			type: 'string',
 		},
+		width: {
+			type: 'string',
+		},
 	},
 	isEligible( { height, width } ) {
 		return height === undefined && width === undefined;