diff --git a/src/libs/portability/win32/rand.cpp b/src/libs/portability/win32/rand.cpp
index 53fb59a3d..0fd8f6f4a 100644
--- a/src/libs/portability/win32/rand.cpp
+++ b/src/libs/portability/win32/rand.cpp
@@ -8,6 +8,7 @@
  * (at your option) any later version.
  */
 
+#define WIN32_LEAN_AND_MEAN
 #include "portability.h"
 #include <windows.h>
 #include <wincrypt.h>
diff --git a/src/libs/portability/win32/rmdir_r.cpp b/src/libs/portability/win32/rmdir_r.cpp
index 702e93ad4..cca9f3e21 100644
--- a/src/libs/portability/win32/rmdir_r.cpp
+++ b/src/libs/portability/win32/rmdir_r.cpp
@@ -8,6 +8,7 @@
  * (at your option) any later version.
  */
 
+#define WIN32_LEAN_AND_MEAN
 #include "portability.h"
 
 #include <windows.h>
diff --git a/src/libs/tgf/modinfo.h b/src/libs/tgf/modinfo.h
index 582b63989..60c28b55f 100644
--- a/src/libs/tgf/modinfo.h
+++ b/src/libs/tgf/modinfo.h
@@ -87,6 +87,10 @@ typedef struct ModInfoNC {
 typedef void* tSOHandle;
 
 #ifdef WIN32
+#ifndef WIN32_LEAN_AND_MEAN
+/* Prevent inclusion of winsock.h in windows.h */
+#define WIN32_LEAN_AND_MEAN
+#endif
 #include <windows.h>
 #define SOHandle(h) ((HMODULE)(h))
 #else
diff --git a/src/libs/tgf/module.cpp b/src/libs/tgf/module.cpp
index 4c13c04b0..f62310e26 100644
--- a/src/libs/tgf/module.cpp
+++ b/src/libs/tgf/module.cpp
@@ -29,6 +29,8 @@
 #include "tgf.hpp"
 
 #ifdef WIN32
+/* Prevent inclusion of winsock.h in windows.h */
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 # define dlopen(pszShLibFileName) (void*)LoadLibrary(pszShLibFileName)
 # define dlsym(pvHandle, pszFuncName) GetProcAddress((HMODULE)pvHandle, pszFuncName)