diff --git a/tests/phpunit/tests/customize/selective-refresh-ajax.php b/tests/phpunit/tests/customize/selective-refresh-ajax.php
index 618cfe15b5..d0cfadc305 100644
--- a/tests/phpunit/tests/customize/selective-refresh-ajax.php
+++ b/tests/phpunit/tests/customize/selective-refresh-ajax.php
@@ -52,6 +52,8 @@ class Test_WP_Customize_Selective_Refresh_Ajax extends WP_UnitTestCase {
 			$this->selective_refresh = $this->wp_customize->selective_refresh;
 		}
 
+		// Remove default theme actions that interfere with tests
+		remove_action( 'customize_register', 'twentyseventeen_customize_register' );
 	}
 
 	/**