diff --git a/library/std/src/sys/random/mod.rs b/library/std/src/sys/random/mod.rs
index d625814d15b39..8ec957c2e6972 100644
--- a/library/std/src/sys/random/mod.rs
+++ b/library/std/src/sys/random/mod.rs
@@ -22,7 +22,7 @@ cfg_if::cfg_if! {
     ))] {
         mod arc4random;
         pub use arc4random::fill_bytes;
-    } else if #[cfg(target_os = "emscripten")] {
+    } else if #[cfg(any(target_os = "emscripten", target_os = "rtems"))] {
         mod getentropy;
         pub use getentropy::fill_bytes;
     } else if #[cfg(target_os = "espidf")] {