diff --git a/src/Makefile b/src/Makefile
index b969ba04665..74ef87b94ed 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -417,6 +417,7 @@ endif
 
 ### On mingw use Windows threads, otherwise POSIX
 ifneq ($(comp),mingw)
+	CXXFLAGS += -DUSE_PTHREADS
 	# On Android Bionic's C library comes with its own pthread implementation bundled in
 	ifneq ($(OS),Android)
 		# Haiku has pthreads in its libroot, so only link it in on other platforms
diff --git a/src/thread_win32_osx.h b/src/thread_win32_osx.h
index c4b55a4812b..75ef5d9a328 100644
--- a/src/thread_win32_osx.h
+++ b/src/thread_win32_osx.h
@@ -27,7 +27,7 @@
 /// The implementation calls pthread_create() with the stack size parameter
 /// equal to the linux 8MB default, on platforms that support it.
 
-#if defined(__APPLE__) || defined(__MINGW32__) || defined(__MINGW64__)
+#if defined(__APPLE__) || defined(__MINGW32__) || defined(__MINGW64__) || defined(USE_PTHREADS)
 
 #include <pthread.h>