diff --git a/includes/class-wc-countries.php b/includes/class-wc-countries.php
index ddab299c7a1..5e44d7feda2 100644
--- a/includes/class-wc-countries.php
+++ b/includes/class-wc-countries.php
@@ -371,7 +371,7 @@ class WC_Countries {
 	 * @return array of country codes.
 	 */
 	public function get_vat_countries() {
-		$eu_countries = get_european_union_countries();
+		$eu_countries = $this->get_european_union_countries();
 
 		$countries = array(
 			'GB',
diff --git a/tests/unit-tests/countries/countries.php b/tests/unit-tests/countries/countries.php
index 1d9099a4f72..007424d6bf2 100644
--- a/tests/unit-tests/countries/countries.php
+++ b/tests/unit-tests/countries/countries.php
@@ -207,7 +207,7 @@ class WC_Tests_Countries extends WC_Unit_Test_Case {
 	public function test_get_european_union_countries() {
 		// After Brexit there should be 27 countries in the EU.
 		$countries = new WC_Countries();
-		$this->assertCount( 27, count( $countries->get_european_union_countries() ) );
+		$this->assertCount( 27, $countries->get_european_union_countries() );
 	}
 
 	/**