diff --git a/src/header/poll/mod.rs b/src/header/poll/mod.rs
index 57fa9cf2b6..08bb87ab23 100644
--- a/src/header/poll/mod.rs
+++ b/src/header/poll/mod.rs
@@ -21,5 +21,11 @@ pub struct pollfd {
 
 #[no_mangle]
 pub extern "C" fn poll(fds: *mut pollfd, nfds: nfds_t, timeout: c_int) -> c_int {
-    Sys::poll(fds, nfds, timeout)
+    trace_expr!(
+        Sys::poll(fds, nfds, timeout),
+        "poll({:p}, {}, {})",
+        fds,
+        nfds,
+        timeout
+    )
 }
diff --git a/src/header/sys_select/mod.rs b/src/header/sys_select/mod.rs
index 17f9e0a739..6565ce402a 100644
--- a/src/header/sys_select/mod.rs
+++ b/src/header/sys_select/mod.rs
@@ -22,5 +22,13 @@ pub extern "C" fn select(
     exceptfds: *mut fd_set,
     timeout: *mut timeval,
 ) -> c_int {
-    Sys::select(nfds, readfds, writefds, exceptfds, timeout)
+    trace_expr!(
+        Sys::select(nfds, readfds, writefds, exceptfds, timeout),
+        "select({}, {:p}, {:p}, {:p}, {:p})",
+        nfds,
+        readfds,
+        writefds,
+        exceptfds,
+        timeout
+    )
 }