diff --git a/trantor/net/EventLoop.cc b/trantor/net/EventLoop.cc
index b4523ad..8009db4 100644
--- a/trantor/net/EventLoop.cc
+++ b/trantor/net/EventLoop.cc
@@ -26,7 +26,7 @@
 #include <assert.h>
 #ifdef _WIN32
 #include <io.h>
-using ssize_t = std::intptr_t;
+using ssize_t = long long;
 #else
 #include <poll.h>
 #endif
diff --git a/trantor/utils/MsgBuffer.h b/trantor/utils/MsgBuffer.h
index bdd5c23..33c8633 100644
--- a/trantor/utils/MsgBuffer.h
+++ b/trantor/utils/MsgBuffer.h
@@ -22,7 +22,7 @@
 #include <assert.h>
 #include <string.h>
 #ifdef _WIN32
-using ssize_t = std::intptr_t;
+using ssize_t = long long;
 #endif
 
 namespace trantor