--- a/js/src/threading/posix/Thread.cpp
+++ b/js/src/threading/posix/Thread.cpp
@@ -165,23 +165,18 @@ js::ThisThread::SetName(const char* name
   MOZ_RELEASE_ASSERT(!rv);
 }
 
 void
 js::ThisThread::GetName(char* nameBuffer, size_t len)
 {
   MOZ_RELEASE_ASSERT(len >= 16);
 
-  int rv;
+  int rv = -1;
 #ifdef HAVE_PTHREAD_GETNAME_NP
   rv = pthread_getname_np(pthread_self(), nameBuffer, len);
-#elif defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__)
-  pthread_get_name_np(pthread_self(), nameBuffer, len);
-  rv = 0;
 #elif defined(__linux__)
   rv = prctl(PR_GET_NAME, reinterpret_cast<unsigned long>(nameBuffer));
-#else
-# error "unsupported platform: no way to read thread name"
 #endif
 
   if (rv)
     nameBuffer[0] = '\0';
 }