diff --git a/tests/catch.h b/tests/catch.h
index 8e780a2d..27888c9d 100644
--- a/tests/catch.h
+++ b/tests/catch.h
@@ -13299,9 +13299,12 @@ RegexMatcher::RegexMatcher(
 
 bool RegexMatcher::match(std::string const &matchee) const
 {
-    auto flags = std::regex::ECMAScript |
-        std::regex::multiline; // ECMAScript is the default syntax
-                               // option anyway
+    auto flags = std::regex::ECMAScript; // ECMAScript is the default syntax
+                                         // option anyway
+#if !defined(_WIN32)
+    flags |= std::regex::multiline;
+#endif
+
     if (m_caseSensitivity == CaseSensitive::Choice::No) {
         flags |= std::regex::icase;
     }
diff --git a/tests/t00056/test_case.h b/tests/t00056/test_case.h
index d271740c..d523766f 100644
--- a/tests/t00056/test_case.h
+++ b/tests/t00056/test_case.h
@@ -55,7 +55,7 @@ TEST_CASE("t00056", "[test-case][class]")
             src, IsConceptRequirement(_A("iterable<T>"), "container.end()"));
 
 #ifdef _MSC_VER
-        REQUIRE_THAT(puml,
+        REQUIRE_THAT(src,
             IsConceptRequirement(
                 _A("convertible_to_string<T>"), "std::string{s}"));
 #else
@@ -162,7 +162,7 @@ TEST_CASE("t00056", "[test-case][class]")
             src, IsConceptRequirement(_A("iterable<T>"), "container.end()"));
 
 #ifdef _MSC_VER
-        REQUIRE_THAT(puml,
+        REQUIRE_THAT(src,
             IsConceptRequirement(
                 _A("convertible_to_string<T>"), "std::string{s}"));
 #else