diff --git a/t/02_assert_disabled.t b/t/02_assert_disabled.t
index 21176da..5ce8e39 100644
--- a/t/02_assert_disabled.t
+++ b/t/02_assert_disabled.t
@@ -1,7 +1,7 @@
 use Test2::V0;
 
 BEGIN {
-    $ENV{PERL_ASSERT_ENABLED} = !!0
+    $ENV{PERL_ASSERT_ENABLED} = 0
 }
 
 use Syntax::Keyword::Assert;
diff --git a/t/10-integration/Syntax-Operator-Is.t b/t/10-integration/Syntax-Operator-Is.t
index 24feca7..81faef4 100644
--- a/t/10-integration/Syntax-Operator-Is.t
+++ b/t/10-integration/Syntax-Operator-Is.t
@@ -1,6 +1,6 @@
 use Test2::V0;
+use Test2::Require::Perl 'v5.38'; # Syntax::Operator::Is requires Perl v5.38+ for custom infix operators
 use Test2::Require::Module 'Syntax::Operator::Is', '0.02';
-use Test2::Require::Module 'XS::Parse::Infix', '0.44';
 use Test2::Require::Module 'Data::Checks', '0.09';
 
 use Syntax::Keyword::Assert;