diff --git a/src/child.rs b/src/child.rs
index 5f30c368..5739041e 100644
--- a/src/child.rs
+++ b/src/child.rs
@@ -126,7 +126,7 @@ pub unsafe fn child_after_clone(child: &ChildInfo) -> ! {
     });
 
     child.cfg.gid.as_ref().map(|&gid| {
-        if libc::setgid(gid) != 0 {
+        if libc::syscall(libc::SYS_setgid, gid as c_ulong) != 0 {
             fail(Err::SetUser, epipe);
         }
     });
@@ -138,7 +138,7 @@ pub unsafe fn child_after_clone(child: &ChildInfo) -> ! {
     });
 
     child.cfg.uid.as_ref().map(|&uid| {
-        if libc::setuid(uid) != 0 {
+        if libc::syscall(libc::SYS_setuid, uid as c_ulong) != 0 {
             fail(Err::SetUser, epipe);
         }
     });