diff --git a/src/unix/thread.c b/src/unix/thread.c
index a267d337..67c78769 100644
--- a/src/unix/thread.c
+++ b/src/unix/thread.c
@@ -78,7 +78,7 @@ int uv_mutex_trylock(uv_mutex_t* mutex) {
 
   r = pthread_mutex_trylock(mutex);
 
-  if (r && r != EAGAIN)
+  if (r && r != EBUSY && r != EAGAIN)
     abort();
 
   if (r)
@@ -119,7 +119,7 @@ int uv_rwlock_tryrdlock(uv_rwlock_t* rwlock) {
 
   r = pthread_rwlock_tryrdlock(rwlock);
 
-  if (r && r != EAGAIN)
+  if (r && r != EBUSY && r != EAGAIN)
     abort();
 
   if (r)
@@ -146,7 +146,7 @@ int uv_rwlock_trywrlock(uv_rwlock_t* rwlock) {
 
   r = pthread_rwlock_trywrlock(rwlock);
 
-  if (r && r != EAGAIN)
+  if (r && r != EBUSY && r != EAGAIN)
     abort();
 
   if (r)