diff --git a/win32/time.h b/win32/time.h
index f841a2b601f..d5d86eb1ed7 100644
--- a/win32/time.h
+++ b/win32/time.h
@@ -50,4 +50,6 @@ PHPAPI extern int setitimer(int which, const struct itimerval *value,
 
 PHPAPI int nanosleep( const struct timespec * rqtp, struct timespec * rmtp );
 
+PHPAPI int usleep(unsigned int useconds);
+
 #endif