diff --git a/include/mingw-fixes/IPHlpApi.h b/include/mingw-fixes/IPHlpApi.h
index 4d08efd..1e9172c 100644
--- a/include/mingw-fixes/IPHlpApi.h
+++ b/include/mingw-fixes/IPHlpApi.h
@@ -1 +1,12 @@
+#ifndef __MINGW_FIXES_IPHLPAPI_H
+#define __MINGW_FIXES_IPHLPAPI_H
+
 #include <iphlpapi.h>
+
+#ifdef __MINGW_FIXES_IPHLPAPI_H_AGAIN
+#include_next <iphlpapi.h>
+#endif
+
+#else
+#define __MINGW_FIXES_IPHLPAPI_H_AGAIN
+#endif
\ No newline at end of file
diff --git a/include/mingw-fixes/Ifdef.h b/include/mingw-fixes/Ifdef.h
index 5283a4a..dd45f57 100644
--- a/include/mingw-fixes/Ifdef.h
+++ b/include/mingw-fixes/Ifdef.h
@@ -1 +1,12 @@
+#ifndef __MINGW_FIXES_IFDEF_H
+#define __MINGW_FIXES_IFDEF_H
+
 #include <ifdef.h>
+
+#ifdef __MINGW_FIXES_IFDEF_H_AGAIN
+#include_next <ifdef.h>
+#endif
+
+#else
+#define __MINGW_FIXES_IFDEF_H_AGAIN
+#endif
\ No newline at end of file
diff --git a/include/mingw-fixes/ShlObj.h b/include/mingw-fixes/ShlObj.h
index 5b17afa..3647691 100644
--- a/include/mingw-fixes/ShlObj.h
+++ b/include/mingw-fixes/ShlObj.h
@@ -1 +1,12 @@
+#ifndef __MINGW_FIXES_SHLOBJ_H
+#define __MINGW_FIXES_SHLOBJ_H
+
 #include <shlobj.h>
+
+#ifdef __MINGW_FIXES_SHLOBJ_H_AGAIN
+#include_next <shlobj.h>
+#endif
+
+#else
+#define __MINGW_FIXES_SHLOBJ_H_AGAIN
+#endif
\ No newline at end of file
diff --git a/include/mingw-fixes/Shlwapi.h b/include/mingw-fixes/Shlwapi.h
index 89b9b63..8ab47aa 100644
--- a/include/mingw-fixes/Shlwapi.h
+++ b/include/mingw-fixes/Shlwapi.h
@@ -1 +1,12 @@
+#ifndef __MINGW_FIXES_SHLWAPI_H
+#define __MINGW_FIXES_SHLWAPI_H
+
 #include <shlwapi.h>
+
+#ifdef __MINGW_FIXES_SHLWAPI_H_AGAIN
+#include_next <shlwapi.h>
+#endif
+
+#else
+#define __MINGW_FIXES_SHLWAPI_H_AGAIN
+#endif
\ No newline at end of file
diff --git a/include/mingw-fixes/Synchapi.h b/include/mingw-fixes/Synchapi.h
index 19e1690..bbcd136 100644
--- a/include/mingw-fixes/Synchapi.h
+++ b/include/mingw-fixes/Synchapi.h
@@ -1 +1,12 @@
+#ifndef __MINGW_FIXES_SYNCHAPI_H
+#define __MINGW_FIXES_SYNCHAPI_H
+
 #include <synchapi.h>
+
+#ifdef __MINGW_FIXES_SYNCHAPI_H_AGAIN
+#include_next <synchapi.h>
+#endif
+
+#else
+#define __MINGW_FIXES_SYNCHAPI_H_AGAIN
+#endif
\ No newline at end of file
diff --git a/include/mingw-fixes/WS2tcpip.h b/include/mingw-fixes/WS2tcpip.h
index 8fc8783..929cc50 100644
--- a/include/mingw-fixes/WS2tcpip.h
+++ b/include/mingw-fixes/WS2tcpip.h
@@ -1 +1,12 @@
+#ifndef __MINGW_FIXES_WS2TCPIP_H
+#define __MINGW_FIXES_WS2TCPIP_H
+
 #include <ws2tcpip.h>
+
+#ifdef __MINGW_FIXES_WS2TCPIP_H_AGAIN
+#include_next <ws2tcpip.h>
+#endif
+
+#else
+#define __MINGW_FIXES_WS2TCPIP_H_AGAIN
+#endif
\ No newline at end of file
diff --git a/include/mingw-fixes/WinSock2.h b/include/mingw-fixes/WinSock2.h
index 29f4ce7..f05d61e 100644
--- a/include/mingw-fixes/WinSock2.h
+++ b/include/mingw-fixes/WinSock2.h
@@ -1 +1,12 @@
+#ifndef __MINGW_FIXES_WINSOCK2_H
+#define __MINGW_FIXES_WINSOCK2_H
+
 #include <winsock2.h>
+
+#ifdef __MINGW_FIXES_WINSOCK2_H_AGAIN
+#include_next <winsock2.h>
+#endif
+
+#else
+#define __MINGW_FIXES_WINSOCK2_H_AGAIN
+#endif
\ No newline at end of file
diff --git a/include/mingw-fixes/Windows.h b/include/mingw-fixes/Windows.h
index 776a87c..07dee6c 100644
--- a/include/mingw-fixes/Windows.h
+++ b/include/mingw-fixes/Windows.h
@@ -1 +1,12 @@
+#ifndef __MINGW_FIXES_WINDOWS_H
+#define __MINGW_FIXES_WINDOWS_H
+
 #include <windows.h>
+
+#ifdef __MINGW_FIXES_WINDOWS_H_AGAIN
+#include_next <windows.h>
+#endif
+
+#else
+#define __MINGW_FIXES_WINDOWS_H_AGAIN
+#endif
\ No newline at end of file