diff --git a/rtc_base/platform_thread.h b/rtc_base/platform_thread.h
index 3ab2761f43..befd61849d 100644
--- a/rtc_base/platform_thread.h
+++ b/rtc_base/platform_thread.h
@@ -13,6 +13,9 @@
 
 #include <functional>
 #include <string>
+#if !defined(WEBRTC_WIN)
+#include <pthread.h>
+#endif
 
 #include "absl/strings/string_view.h"
 #include "absl/types/optional.h"