diff --git a/vlib/os/os_windows.c.v b/vlib/os/os_windows.c.v
index 270f093123..20e1ac643a 100644
--- a/vlib/os/os_windows.c.v
+++ b/vlib/os/os_windows.c.v
@@ -4,6 +4,7 @@ import strings
 
 #flag -lws2_32
 #include <winsock2.h>
+#include <process.h>
 
 pub const (
 	path_separator = '\\'