diff --git a/packages/core-data/src/utils/set-nested-value.js b/packages/core-data/src/utils/set-nested-value.js
index cb7db8a04b4b0..e90bf23e4dad8 100644
--- a/packages/core-data/src/utils/set-nested-value.js
+++ b/packages/core-data/src/utils/set-nested-value.js
@@ -10,6 +10,8 @@
  *
  * @see https://lodash.com/docs/4.17.15#set
  *
+ * @todo Needs to be deduplicated with its copy in `@wordpress/edit-site`.
+ *
  * @param {Object} object Object to modify
  * @param {Array}  path   Path of the property to set.
  * @param {*}      value  Value to set.
diff --git a/packages/edit-site/src/hooks/push-changes-to-global-styles/index.js b/packages/edit-site/src/hooks/push-changes-to-global-styles/index.js
index d82f3a86847da..ab2487e76f191 100644
--- a/packages/edit-site/src/hooks/push-changes-to-global-styles/index.js
+++ b/packages/edit-site/src/hooks/push-changes-to-global-styles/index.js
@@ -1,7 +1,7 @@
 /**
  * External dependencies
  */
-import { get, set } from 'lodash';
+import { get } from 'lodash';
 
 /**
  * WordPress dependencies
@@ -119,6 +119,46 @@ function useChangesToPush( name, attributes ) {
 	);
 }
 
+/**
+ * Sets the value at path of object.
+ * If a portion of path doesn’t exist, it’s created.
+ * Arrays are created for missing index properties while objects are created
+ * for all other missing properties.
+ *
+ * This function intentionally mutates the input object.
+ *
+ * Inspired by _.set().
+ *
+ * @see https://lodash.com/docs/4.17.15#set
+ *
+ * @todo Needs to be deduplicated with its copy in `@wordpress/core-data`.
+ *
+ * @param {Object} object Object to modify
+ * @param {Array}  path   Path of the property to set.
+ * @param {*}      value  Value to set.
+ */
+function setNestedValue( object, path, value ) {
+	if ( ! object || typeof object !== 'object' ) {
+		return object;
+	}
+
+	path.reduce( ( acc, key, idx ) => {
+		if ( acc[ key ] === undefined ) {
+			if ( Number.isInteger( path[ idx + 1 ] ) ) {
+				acc[ key ] = [];
+			} else {
+				acc[ key ] = {};
+			}
+		}
+		if ( idx === path.length - 1 ) {
+			acc[ key ] = value;
+		}
+		return acc[ key ];
+	}, object );
+
+	return object;
+}
+
 function cloneDeep( object ) {
 	return ! object ? {} : JSON.parse( JSON.stringify( object ) );
 }
@@ -148,8 +188,12 @@ function PushChangesToGlobalStylesControl( {
 		const newUserConfig = cloneDeep( userConfig );
 
 		for ( const { path, value } of changes ) {
-			set( newBlockStyles, path, undefined );
-			set( newUserConfig, [ 'styles', 'blocks', name, ...path ], value );
+			setNestedValue( newBlockStyles, path, undefined );
+			setNestedValue(
+				newUserConfig,
+				[ 'styles', 'blocks', name, ...path ],
+				value
+			);
 		}
 
 		// @wordpress/core-data doesn't support editing multiple entity types in