diff --git a/library/std/src/sys/pal/unix/process/process_unix.rs b/library/std/src/sys/pal/unix/process/process_unix.rs
index e2fca8c7e63dc..72bda90a9ba71 100644
--- a/library/std/src/sys/pal/unix/process/process_unix.rs
+++ b/library/std/src/sys/pal/unix/process/process_unix.rs
@@ -1053,6 +1053,10 @@ fn signal_string(signal: i32) -> &'static str {
         libc::SIGINFO => " (SIGINFO)",
         #[cfg(target_os = "hurd")]
         libc::SIGLOST => " (SIGLOST)",
+        #[cfg(target_os = "freebsd")]
+        libc::SIGTHR => " (SIGTHR)",
+        #[cfg(target_os = "freebsd")]
+        libc::SIGLIBRT => " (SIGLIBRT)",
         _ => "",
     }
 }