diff --git a/packages/style-engine/class-wp-style-engine.php b/packages/style-engine/class-wp-style-engine.php
index bc37daf05562af..387dec98b4687b 100644
--- a/packages/style-engine/class-wp-style-engine.php
+++ b/packages/style-engine/class-wp-style-engine.php
@@ -436,7 +436,7 @@ public function get_block_supports_styles( $block_styles, $options ) {
 			$styles_output['declarations'] = $css_declarations->get_declarations();
 			// Return an entire rule if there is a selector.
 			if ( $css_selector ) {
-				$styles_output['css'] = $css_selector . ' { ' . $css . ' }';
+				$styles_output['css'] = $css_selector . '{' . $css . '}';
 			}
 		}