diff --git a/test/sys/test_ptrace.rs b/test/sys/test_ptrace.rs
index 393967cee2..d7c7f0058b 100644
--- a/test/sys/test_ptrace.rs
+++ b/test/sys/test_ptrace.rs
@@ -139,10 +139,10 @@ fn test_ptrace_syscall() {
             ptrace::setoptions(child, ptrace::Options::PTRACE_O_TRACESYSGOOD).unwrap();
 
             #[cfg(target_arch = "x86_64")]
-            let get_syscall_id = || ptrace::getregs(child).unwrap().orig_rax as i64;
+            let get_syscall_id = || ptrace::getregs(child).unwrap().orig_rax;
 
             #[cfg(target_arch = "x86")]
-            let get_syscall_id = || ptrace::getregs(child).unwrap().orig_eax as i64;
+            let get_syscall_id = || ptrace::getregs(child).unwrap().orig_eax;
 
             // kill entry
             ptrace::syscall(child, None).unwrap();