diff --git a/actix-web/src/http/header/content_length.rs b/actix-web/src/http/header/content_length.rs
index 557c7c9f5..1bb5545ae 100644
--- a/actix-web/src/http/header/content_length.rs
+++ b/actix-web/src/http/header/content_length.rs
@@ -214,7 +214,11 @@ mod tests {
         assert_parse_eq::<ContentLength, _, _>([" 0"], ContentLength(0));
         assert_parse_eq::<ContentLength, _, _>(["0 "], ContentLength(0));
         assert_parse_eq::<ContentLength, _, _>([" 0 "], ContentLength(0));
+    }
 
+    #[cfg(target_pointer_width = "64")]
+    #[test]
+    fn good_header_max_usize() {
         // large value (2^64 - 1)
         assert_parse_eq::<ContentLength, _, _>(
             ["18446744073709551615"],