diff --git a/src/shims/foreign_items/posix.rs b/src/shims/foreign_items/posix.rs
index c9fd59c69327..4be63804a45b 100644
--- a/src/shims/foreign_items/posix.rs
+++ b/src/shims/foreign_items/posix.rs
@@ -271,8 +271,10 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
             | "pthread_mutex_unlock"
             | "pthread_mutex_destroy"
             | "pthread_rwlock_rdlock"
+            | "pthread_rwlock_tryrdlock"
             | "pthread_rwlock_unlock"
             | "pthread_rwlock_wrlock"
+            | "pthread_rwlock_trywrlock"
             | "pthread_rwlock_destroy"
             | "pthread_condattr_init"
             | "pthread_condattr_setclock"
diff --git a/tests/run-pass/sync.rs b/tests/run-pass/sync.rs
index 54d79566eae4..14243349f967 100644
--- a/tests/run-pass/sync.rs
+++ b/tests/run-pass/sync.rs
@@ -12,7 +12,9 @@ fn main() {
     {
         let rw = sync::RwLock::new(0);
         drop(rw.read());
+        drop(rw.try_read());
         drop(rw.write());
+        drop(rw.try_write());
         drop(rw);
     }
 }