diff --git a/panda/src/downloader/bioStreamBuf.cxx b/panda/src/downloader/bioStreamBuf.cxx
index d2b1ba8f77..2c907fdb16 100644
--- a/panda/src/downloader/bioStreamBuf.cxx
+++ b/panda/src/downloader/bioStreamBuf.cxx
@@ -24,6 +24,7 @@
 #ifdef HAVE_OPENSSL
 
 #ifdef WIN32_VC
+  #include <WinSock2.h>
   #include <windows.h>  // for WSAGetLastError()
   #undef X509_NAME
 #endif  // WIN32_VC
diff --git a/panda/src/downloader/httpChannel.cxx b/panda/src/downloader/httpChannel.cxx
index deb9e0c9e0..92494a3b98 100644
--- a/panda/src/downloader/httpChannel.cxx
+++ b/panda/src/downloader/httpChannel.cxx
@@ -30,6 +30,7 @@
 #include "openssl/x509.h"
 
 #ifdef WIN32_VC
+  #include <WinSock2.h>
   #include <windows.h>  // for select()
   #undef X509_NAME
 #endif  // WIN32_VC
diff --git a/panda/src/pstatclient/pStatClientImpl.cxx b/panda/src/pstatclient/pStatClientImpl.cxx
index d968205496..56cc4ea32e 100644
--- a/panda/src/pstatclient/pStatClientImpl.cxx
+++ b/panda/src/pstatclient/pStatClientImpl.cxx
@@ -33,6 +33,7 @@
 #include <algorithm>
 
 #ifdef WIN32_VC
+#include <Winsock2.h>
 #include <windows.h>
 #endif