diff --git a/WordPressVIPMinimum/Tests/Constants/ConstantStringUnitTest.inc b/WordPressVIPMinimum/Tests/Constants/ConstantStringUnitTest.inc
index 5bace853..b07e5e7f 100644
--- a/WordPressVIPMinimum/Tests/Constants/ConstantStringUnitTest.inc
+++ b/WordPressVIPMinimum/Tests/Constants/ConstantStringUnitTest.inc
@@ -8,7 +8,7 @@ if ( ! defined( WPCOM_VIP ) ) { // Error.
 	define( WPCOM_VIP ); // Error.
 }
 
-namespace Foo/Bar;
+namespace Foo\Bar;
 const REST_ALLOWED_META_PREFIXES = [ 'foo-', 'bar-', 'baz-' ];
 if ( defined( __NAMESPACE__ . '\REST_ALLOWED_META_PREFIXES' ) && in_array( 'foo-', REST_ALLOWED_META_PREFIXES, true ) ) { // Ok.
 	define( __NAMESPACE__ . REST_ALLOWED_META_PREFIXES ); // Error.