diff --git a/src/standard/thread.c b/src/standard/thread.c
index 2572a740..64b1e960 100644
--- a/src/standard/thread.c
+++ b/src/standard/thread.c
@@ -18,7 +18,12 @@
 #endif /* HAVE_UNISTD_H */
 
 #ifdef _WIN32
+#define _POSIX 1
 #include <windows.h>
+#including <sys/types.h>
+#ifndef SIGUSR2
+#define SIGUSR2 31
+#endif
 #endif
 
 typedef struct {