diff --git a/libc/bionic/pthread.c b/libc/bionic/pthread.c
index ac7c64e..c7612f7 100644
--- a/libc/bionic/pthread.c
+++ b/libc/bionic/pthread.c
@@ -633,14 +633,18 @@
 int pthread_join(pthread_t thid, void ** ret_val)
 {
     pthread_internal_t*  thread = (pthread_internal_t*)thid;
-    int                  count;
+    if (thid == pthread_self()) {
+        return EDEADLK;
+    }
 
     // check that the thread still exists and is not detached
     pthread_mutex_lock(&gThreadListLock);
 
-    for (thread = gThreadList; thread != NULL; thread = thread->next)
-        if (thread == (pthread_internal_t*)thid)
+    for (thread = gThreadList; thread != NULL; thread = thread->next) {
+        if (thread == (pthread_internal_t*)thid) {
             goto FoundIt;
+        }
+    }
 
     pthread_mutex_unlock(&gThreadListLock);
     return ESRCH;
@@ -658,7 +662,7 @@
     *
     * otherwise, we need to increment 'join-count' and wait to be signaled
     */
-   count = thread->join_count;
+    int count = thread->join_count;
     if (count >= 0) {
         thread->join_count += 1;
         pthread_cond_wait( &thread->join_cond, &gThreadListLock );
diff --git a/tests/pthread_test.cpp b/tests/pthread_test.cpp
index 9a474c0..479c462 100644
--- a/tests/pthread_test.cpp
+++ b/tests/pthread_test.cpp
@@ -80,3 +80,8 @@
   ASSERT_EQ(0, pthread_join(t2, &join_result));
   ASSERT_EQ(EINVAL, reinterpret_cast<int>(join_result));
 }
+
+TEST(pthread, pthread_join_self) {
+  void* result;
+  ASSERT_EQ(EDEADLK, pthread_join(pthread_self(), &result));
+}