diff --git a/crypto/compat/posix_win.c b/crypto/compat/posix_win.c
index c6ff924..110323a 100644
--- a/crypto/compat/posix_win.c
+++ b/crypto/compat/posix_win.c
@@ -12,6 +12,7 @@
 #include <ws2tcpip.h>
 
 #include <errno.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>