diff --git a/windows/JackMMCSS.h b/windows/JackMMCSS.h
index faf33188..19329aed 100644
--- a/windows/JackMMCSS.h
+++ b/windows/JackMMCSS.h
@@ -24,6 +24,9 @@
 
 #include "JackSystemDeps.h"
 #include "JackCompilerDeps.h"
+#ifdef __MINGW32__
+#include <winsock2.h>
+#endif
 #include <windows.h>
 #include <map>
 
diff --git a/windows/JackRouter/JackRouter.h b/windows/JackRouter/JackRouter.h
index a50e11a8..c48d8d69 100644
--- a/windows/JackRouter/JackRouter.h
+++ b/windows/JackRouter/JackRouter.h
@@ -37,10 +37,13 @@ static int	kNumOutputs = 4;
 #include "jack.h"
 #include "rpc.h"
 #include "rpcndr.h"
+
 #ifndef COM_NO_WINDOWS_H
+#ifdef __MINGW32__
+#include <winsock2.h>
+#endif
 #include <windows.h>
 #include "ole2.h"
-
 #endif
 
 #include "combase.h"
diff --git a/windows/JackShmMem_os.h b/windows/JackShmMem_os.h
index 9f1891f9..aa77de9c 100644
--- a/windows/JackShmMem_os.h
+++ b/windows/JackShmMem_os.h
@@ -20,6 +20,9 @@
 #ifndef __JackShmMem_WIN32__
 #define __JackShmMem_WIN32__
 
+#ifdef __MINGW32__
+#include <winsock2.h>
+#endif
 #include <windows.h>
 
 inline bool CHECK_MLOCK(void* ptr, size_t size)
diff --git a/windows/JackSystemDeps_os.h b/windows/JackSystemDeps_os.h
index 0f1747a3..d30c9401 100644
--- a/windows/JackSystemDeps_os.h
+++ b/windows/JackSystemDeps_os.h
@@ -21,6 +21,9 @@
 #ifndef __JackSystemDeps_WIN32__
 #define __JackSystemDeps_WIN32__
 
+#ifdef __MINGW32__
+#include <winsock2.h>
+#endif
 #include <windows.h>
 #include "JackCompilerDeps.h"
 
diff --git a/windows/JackWinEvent.h b/windows/JackWinEvent.h
index dadda1c4..503aaaba 100644
--- a/windows/JackWinEvent.h
+++ b/windows/JackWinEvent.h
@@ -21,6 +21,10 @@
 #define __JackWinEvent__
 
 #include "JackSynchro.h"
+
+#ifdef __MINGW32__
+#include <winsock2.h>
+#endif
 #include <windows.h>
 
 namespace Jack
diff --git a/windows/JackWinNamedPipe.h b/windows/JackWinNamedPipe.h
index 01e971a4..0e3510f7 100644
--- a/windows/JackWinNamedPipe.h
+++ b/windows/JackWinNamedPipe.h
@@ -21,6 +21,9 @@
 #ifndef __JackWinNamedPipe__
 #define __JackWinNamedPipe__
 
+#ifdef __MINGW32__
+#include <winsock2.h>
+#endif
 #include <windows.h>
 
 #include "JackChannel.h"
diff --git a/windows/JackWinSemaphore.h b/windows/JackWinSemaphore.h
index c3871c9a..e125c5b6 100644
--- a/windows/JackWinSemaphore.h
+++ b/windows/JackWinSemaphore.h
@@ -22,6 +22,9 @@
 #define __JackWinSemaphore__
 
 #include "JackSynchro.h"
+#ifdef __MINGW32__
+#include <winsock2.h>
+#endif
 #include <windows.h>
 #include <assert.h>
 
diff --git a/windows/JackWinThread.h b/windows/JackWinThread.h
index 106e9963..dcc19e8d 100644
--- a/windows/JackWinThread.h
+++ b/windows/JackWinThread.h
@@ -24,6 +24,9 @@
 #include "JackMMCSS.h"
 #include "JackCompilerDeps.h"
 #include "JackSystemDeps.h"
+#ifdef __MINGW32__
+#include <winsock2.h>
+#endif
 #include <windows.h>
 
 namespace Jack
diff --git a/windows/winmme/JackWinMMEPort.h b/windows/winmme/JackWinMMEPort.h
index bfe683b5..e0563f52 100644
--- a/windows/winmme/JackWinMMEPort.h
+++ b/windows/winmme/JackWinMMEPort.h
@@ -20,6 +20,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #ifndef __JackWinMMEPort__
 #define __JackWinMMEPort__
 
+#ifdef __MINGW32__
+#include <winsock2.h>
+#endif
 #include <windows.h>
 #include <mmsystem.h>