diff --git a/packages/block-editor/src/components/block-tools/style.scss b/packages/block-editor/src/components/block-tools/style.scss
index 80fe4c420d1e1..35d075c1a99b7 100644
--- a/packages/block-editor/src/components/block-tools/style.scss
+++ b/packages/block-editor/src/components/block-tools/style.scss
@@ -78,6 +78,7 @@
 		color: $white;
 		padding: 0;
 
+		// TODO: Consider passing size="small" to the Inserter toggle instead.
 		// Special dimensions for this button.
 		min-width: $button-size-small;
 		height: $button-size-small;
diff --git a/packages/block-editor/src/components/default-block-appender/content.scss b/packages/block-editor/src/components/default-block-appender/content.scss
index 71ede90d25c0c..361268fb2b37d 100644
--- a/packages/block-editor/src/components/default-block-appender/content.scss
+++ b/packages/block-editor/src/components/default-block-appender/content.scss
@@ -42,6 +42,7 @@
 		color: $white;
 		padding: 0;
 
+		// TODO: Consider passing size="small" to the Inserter toggle instead.
 		// Special dimensions for this button.
 		min-width: $button-size-small;
 		height: $button-size-small;
diff --git a/packages/block-editor/src/components/inserter/index.js b/packages/block-editor/src/components/inserter/index.js
index 47304a7d77174..59d78a6f0edc6 100644
--- a/packages/block-editor/src/components/inserter/index.js
+++ b/packages/block-editor/src/components/inserter/index.js
@@ -60,6 +60,7 @@ const defaultRenderToggle = ( {
 
 	return (
 		<Wrapper
+			__next40pxDefaultSize={ toggleProps.as ? undefined : true }
 			icon={ plus }
 			label={ label }
 			tooltipPosition="bottom"