diff --git a/dll/dll/common_includes.h b/dll/dll/common_includes.h
index cbb0845e..1e244840 100644
--- a/dll/dll/common_includes.h
+++ b/dll/dll/common_includes.h
@@ -84,7 +84,6 @@
     #include <windows.h>
     #include <ws2tcpip.h>
     #include <processthreadsapi.h>
-    #include <windows.h>
     #include <direct.h>
     #include <iphlpapi.h> // Include winsock2 before this, or winsock2 iphlpapi will be unavailable
     #include <shlobj.h>
diff --git a/steamclient/steamclient.cpp b/steamclient/steamclient.cpp
index 33b32c08..3f1b8bb4 100644
--- a/steamclient/steamclient.cpp
+++ b/steamclient/steamclient.cpp
@@ -1,5 +1,6 @@
 
 //#include "dll.h"
+#define WIN32_LEAN_AND_MEAN
 #include "Windows.h"
 #ifdef _WIN64
 #define DLL_NAME "steam_api64.dll"
diff --git a/tools/lobby_connect/lobby_connect.cpp b/tools/lobby_connect/lobby_connect.cpp
index cce7fea3..45257a46 100644
--- a/tools/lobby_connect/lobby_connect.cpp
+++ b/tools/lobby_connect/lobby_connect.cpp
@@ -29,6 +29,7 @@
 #include <fstream>
 
 #ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #else