diff --git a/src/util/lexical.rs b/src/util/lexical.rs
index 623b7d84715..047986cbbed 100644
--- a/src/util/lexical.rs
+++ b/src/util/lexical.rs
@@ -22,8 +22,16 @@ pub fn lexical_to_bytes_mut<N: lexical_core::ToLexical>(n: N, buf: &mut Vec<u8>)
 
         //  Safety:
         //  Omits an unneeded bound check as we just ensured that we reserved `N::FORMATTED_SIZE_DECIMAL`
-        let len = lexical_core::write_unchecked(n, slice).len();
-        buf.set_len(len);
+        #[cfg(debug_assertions)]
+        {
+            let len = lexical_core::write(n, slice).len();
+            buf.set_len(len);
+        }
+        #[cfg(not(debug_assertions))]
+        {
+            let len = lexical_core::write_unchecked(n, slice).len();
+            buf.set_len(len);
+        }
     }
 }