diff --git a/libcxx/test/std/language.support/cmp/cmp.alg/compare_strong_order_fallback.pass.cpp b/libcxx/test/std/language.support/cmp/cmp.alg/compare_strong_order_fallback.pass.cpp
--- a/libcxx/test/std/language.support/cmp/cmp.alg/compare_strong_order_fallback.pass.cpp
+++ b/libcxx/test/std/language.support/cmp/cmp.alg/compare_strong_order_fallback.pass.cpp
@@ -348,10 +348,10 @@
     // at compile-time, so the NAN-related tests must be runtime-only.
 
     if (!std::is_constant_evaluated()) {
-        F nq = _VSTD::copysign(std::numeric_limits<F>::quiet_NaN(), F(-1));
-        F ns = _VSTD::copysign(std::numeric_limits<F>::signaling_NaN(), F(-1));
-        F ps = _VSTD::copysign(std::numeric_limits<F>::signaling_NaN(), F(+1));
-        F pq = _VSTD::copysign(std::numeric_limits<F>::quiet_NaN(), F(+1));
+        F nq = std::copysign(std::numeric_limits<F>::quiet_NaN(), F(-1));
+        F ns = std::copysign(std::numeric_limits<F>::signaling_NaN(), F(-1));
+        F ps = std::copysign(std::numeric_limits<F>::signaling_NaN(), F(+1));
+        F pq = std::copysign(std::numeric_limits<F>::quiet_NaN(), F(+1));
 
         assert(std::compare_strong_order_fallback(nq, nq) == std::strong_ordering::equal);
 #ifndef TEST_BUGGY_SIGNALING_NAN
diff --git a/libcxx/test/std/language.support/cmp/cmp.alg/compare_weak_order_fallback.pass.cpp b/libcxx/test/std/language.support/cmp/cmp.alg/compare_weak_order_fallback.pass.cpp
--- a/libcxx/test/std/language.support/cmp/cmp.alg/compare_weak_order_fallback.pass.cpp
+++ b/libcxx/test/std/language.support/cmp/cmp.alg/compare_weak_order_fallback.pass.cpp
@@ -347,10 +347,10 @@
     // at compile-time, so the NAN-related tests must be runtime-only.
 
     if (!std::is_constant_evaluated()) {
-        F nq = _VSTD::copysign(std::numeric_limits<F>::quiet_NaN(), F(-1));
-        F ns = _VSTD::copysign(std::numeric_limits<F>::signaling_NaN(), F(-1));
-        F ps = _VSTD::copysign(std::numeric_limits<F>::signaling_NaN(), F(+1));
-        F pq = _VSTD::copysign(std::numeric_limits<F>::quiet_NaN(), F(+1));
+        F nq = std::copysign(std::numeric_limits<F>::quiet_NaN(), F(-1));
+        F ns = std::copysign(std::numeric_limits<F>::signaling_NaN(), F(-1));
+        F ps = std::copysign(std::numeric_limits<F>::signaling_NaN(), F(+1));
+        F pq = std::copysign(std::numeric_limits<F>::quiet_NaN(), F(+1));
 
         assert(std::compare_weak_order_fallback(nq, nq) == std::weak_ordering::equivalent);
         assert(std::compare_weak_order_fallback(nq, ns) == std::weak_ordering::equivalent);