diff --git a/src/wp-includes/theme-templates.php b/src/wp-includes/theme-templates.php
index 7ebc3cdc1a793..f31cacd39ab1a 100644
--- a/src/wp-includes/theme-templates.php
+++ b/src/wp-includes/theme-templates.php
@@ -50,8 +50,8 @@ function wp_filter_wp_template_unique_post_slug( $override_slug, $slug, $post_id
 	}
 
 	// For wp_template, slugs no longer have to be unique within the same theme.
-	if ( 'wp_template' !== $post_type ) {
-		return $override_slug;
+	if ( 'wp_template' === $post_type ) {
+		return $slug;
 	}
 
 	if ( ! $override_slug ) {