diff --git a/test/sys/test_ptrace.rs b/test/sys/test_ptrace.rs
index e86c75cb54..ece1f6027a 100644
--- a/test/sys/test_ptrace.rs
+++ b/test/sys/test_ptrace.rs
@@ -138,8 +138,12 @@ fn test_ptrace_syscall() {
             // set this option to recognize syscall-stops
             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;
 
+            #[cfg(target_arch = "x86")]
+            let get_syscall_id = || ptrace::getregs(child).unwrap().orig_eax as i32;
+
             // kill entry
             ptrace::syscall(child, None).unwrap();
             assert_eq!(waitpid(child, None), Ok(WaitStatus::PtraceSyscall(child)));