diff --git a/lib/base/win32.hpp b/lib/base/win32.hpp
index 0965e1bd8..ef90352c1 100644
--- a/lib/base/win32.hpp
+++ b/lib/base/win32.hpp
@@ -40,6 +40,7 @@
 #endif /* __MINGW32__ */
 
 typedef int socklen_t;
+typedef SSIZE_T ssize_t;
 
 #define MAXPATHLEN MAX_PATH