diff --git a/library/compiler-builtins/libm/src/math/rem_pio2_large.rs b/library/compiler-builtins/libm/src/math/rem_pio2_large.rs
index 809724df4194..18dc721c6518 100644
--- a/library/compiler-builtins/libm/src/math/rem_pio2_large.rs
+++ b/library/compiler-builtins/libm/src/math/rem_pio2_large.rs
@@ -255,7 +255,7 @@ pub(crate) fn rem_pio2_large(x : &[f64], y : &mut [f64], e0 : i32, prec : usize)
     let x1p24  = f64::from_bits(0x4170000000000000); // 0x1p24 === 2 ^ 24
     let x1p_24 = f64::from_bits(0x3e70000000000000); // 0x1p_24 === 2 ^ (-24)
     
-    #[cfg(not(ldbl_max_exp_more1024))]
+    #[cfg(target_pointer_width = "64")]
     assert!(e0 <= 16360);
     
     let nx = x.len();