diff --git a/lldb/source/Host/common/MainLoop.cpp b/lldb/source/Host/common/MainLoop.cpp
index 113606126145..923d37b44a90 100644
--- a/lldb/source/Host/common/MainLoop.cpp
+++ b/lldb/source/Host/common/MainLoop.cpp
@@ -142,7 +142,6 @@ void MainLoop::UnregisterReadObject(IOObject::WaitableHandle handle) {
 void MainLoop::UnregisterSignal(int signo) {
 #if SIGNAL_POLLING_UNSUPPORTED
   Error("Signal polling is not supported on this platform.");
-  return nullptr;
 #else
   // We undo the actions of RegisterSignal on a best-effort basis.
   auto it = m_signals.find(signo);