diff --git a/libstdc++-v3/testsuite/26_numerics/numbers/float128.cc b/libstdc++-v3/testsuite/26_numerics/numbers/float128.cc
index 51ce21570e0..421af7af67f 100644
--- a/libstdc++-v3/testsuite/26_numerics/numbers/float128.cc
+++ b/libstdc++-v3/testsuite/26_numerics/numbers/float128.cc
@@ -20,7 +20,7 @@
 
 #include <numbers>
 
-#if defined(_GLIBCXX_USE_FLOAT128)
+#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
 void
 test01()
 {
diff --git a/libstdc++-v3/testsuite/std/concepts/concepts.lang/concept.arithmetic/floating_point.cc b/libstdc++-v3/testsuite/std/concepts/concepts.lang/concept.arithmetic/floating_point.cc
index 1e7d649b6a7..9617889505f 100644
--- a/libstdc++-v3/testsuite/std/concepts/concepts.lang/concept.arithmetic/floating_point.cc
+++ b/libstdc++-v3/testsuite/std/concepts/concepts.lang/concept.arithmetic/floating_point.cc
@@ -23,7 +23,7 @@
 static_assert( std::floating_point<float> );
 static_assert( std::floating_point<double> );
 static_assert( std::floating_point<long double> );
-#ifdef _GLIBCXX_USE_FLOAT128
+#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
 static_assert( std::floating_point<__float128> );
 #endif