diff --git a/libc/test/src/math/smoke/SubTest.h b/libc/test/src/math/smoke/SubTest.h
@@ -37,23 +37,8 @@ class SubTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
     EXPECT_FP_IS_NAN_WITH_EXCEPTION(func(sNaN, sNaN), FE_INVALID);
 
     InType qnan_42 = InFPBits::quiet_nan(Sign::POS, 0x42).get_val();
-    EXPECT_FP_EQ(InType(0x42.0p+0),
-                 LIBC_NAMESPACE::fputil::getpayload(func(qnan_42, zero)));
-    EXPECT_FP_EQ(InType(0x42.0p+0),
-                 LIBC_NAMESPACE::fputil::getpayload(func(zero, qnan_42)));
-
-    if constexpr (sizeof(OutType) < sizeof(InType)) {
-      InStorageType max_payload = InFPBits::FRACTION_MASK >> 1;
-      InType qnan_max = InFPBits::quiet_nan(Sign::POS, max_payload).get_val();
-      EXPECT_FP_EQ(zero,
-                   LIBC_NAMESPACE::fputil::getpayload(func(qnan_max, zero)));
-      EXPECT_FP_EQ(zero,
-                   LIBC_NAMESPACE::fputil::getpayload(func(zero, qnan_max)));
-      EXPECT_FP_EQ(InType(0x42.0p+0),
-                   LIBC_NAMESPACE::fputil::getpayload(func(qnan_max, qnan_42)));
-      EXPECT_FP_EQ(InType(0x42.0p+0),
-                   LIBC_NAMESPACE::fputil::getpayload(func(qnan_42, qnan_max)));
-    }
+    EXPECT_FP_IS_NAN(func(qnan_42, zero));
+    EXPECT_FP_IS_NAN(func(zero, qnan_42));
 
     EXPECT_FP_EQ(inf, func(inf, zero));
     EXPECT_FP_EQ(neg_inf, func(neg_inf, zero));