diff --git a/src/util/os_socket.h b/src/util/os_socket.h
index 0e413ef353e..0d6f8749176 100644
--- a/src/util/os_socket.h
+++ b/src/util/os_socket.h
@@ -10,6 +10,10 @@
 
 #include <stdio.h>
 #include <stdbool.h>
+#ifdef _MSC_VER
+#include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#endif
 
 #ifdef __cplusplus
 extern "C" {