diff --git a/tests/unit-tests/importer/product.php b/tests/unit-tests/importer/product.php
index 28f4fe9d5ac..01633f00408 100644
--- a/tests/unit-tests/importer/product.php
+++ b/tests/unit-tests/importer/product.php
@@ -306,7 +306,7 @@ class WC_Tests_Product_CSV_Importer extends WC_Unit_Test_Case {
 				'tax_class'             => 'standard',
 				'stock_status'          => 'instock',
 				'stock_quantity'        => '',
-				'backorders'            => '',
+				'backorders'            => 'no',
 				'sold_individually'     => '',
 				'weight'                => '',
 				'length'                => '',
@@ -358,7 +358,7 @@ class WC_Tests_Product_CSV_Importer extends WC_Unit_Test_Case {
 				'tax_class'          => 'standard',
 				'stock_status'       => 'instock',
 				'stock_quantity'     => '',
-				'backorders'         => '',
+				'backorders'         => 'no',
 				'sold_individually'  => '',
 				'weight'             => '',
 				'length'             => '',
@@ -394,7 +394,7 @@ class WC_Tests_Product_CSV_Importer extends WC_Unit_Test_Case {
 				'tax_class'             => '',
 				'stock_status'          => 'outofstock',
 				'stock_quantity'        => '',
-				'backorders'            => '',
+				'backorders'            => 'no',
 				'sold_individually'     => '',
 				'weight'                => '',
 				'length'                => '',
@@ -446,7 +446,7 @@ class WC_Tests_Product_CSV_Importer extends WC_Unit_Test_Case {
 				'tax_class'             => 'standard',
 				'stock_status'          => 'instock',
 				'stock_quantity'        => 6,
-				'backorders'            => '',
+				'backorders'            => 'no',
 				'sold_individually'     => '',
 				'weight'                => 1.0,
 				'length'                => 2.0,
@@ -536,7 +536,7 @@ class WC_Tests_Product_CSV_Importer extends WC_Unit_Test_Case {
 				'tax_class'             => '',
 				'stock_status'          => 'instock',
 				'stock_quantity'        => '',
-				'backorders'            => '',
+				'backorders'            => 'no',
 				'sold_individually'     => '',
 				'weight'                => '',
 				'length'                => '',