diff --git a/miniupnpc/connecthostport.c b/miniupnpc/connecthostport.c
index 9a459e7..20a87f8 100644
--- a/miniupnpc/connecthostport.c
+++ b/miniupnpc/connecthostport.c
@@ -41,19 +41,6 @@
 #include <sys/select.h>
 #endif /* #else _WIN32 */
 
-/* definition of PRINT_SOCKET_ERROR */
-#ifdef _WIN32
-#define PRINT_SOCKET_ERROR(x)    fprintf(stderr, "Socket error: %s, %d\n", x, WSAGetLastError());
-#else
-#define PRINT_SOCKET_ERROR(x) perror(x)
-#endif
-
-#ifdef _MSC_VER
-#define MSC_CAST_INT (int)
-#else
-#define MSC_CAST_INT
-#endif
-
 #if defined(__amigaos__) || defined(__amigaos4__)
 #define herror(A) printf("%s\n", A)
 #endif
diff --git a/miniupnpc/minisoap.c b/miniupnpc/minisoap.c
index e76558a..f92b36c 100644
--- a/miniupnpc/minisoap.c
+++ b/miniupnpc/minisoap.c
@@ -25,12 +25,6 @@
 /* only for malloc */
 #include <stdlib.h>
 
-#ifdef _WIN32
-#define PRINT_SOCKET_ERROR(x)    fprintf(stderr, "Socket error: %s, %d\n", x, WSAGetLastError());
-#else
-#define PRINT_SOCKET_ERROR(x) perror(x)
-#endif
-
 /* httpWrite sends the headers and the body to the socket
  * and returns the number of bytes sent */
 static int
diff --git a/miniupnpc/minissdpc.c b/miniupnpc/minissdpc.c
index 25ffcce..3d57e5a 100644
--- a/miniupnpc/minissdpc.c
+++ b/miniupnpc/minissdpc.c
@@ -60,12 +60,6 @@ struct sockaddr_un {
 #define closesocket close
 #endif
 
-#ifdef _MSC_VER
-#define MSC_CAST_INT (int)
-#else
-#define MSC_CAST_INT
-#endif
-
 #include "miniupnpc_socketdef.h"
 
 #if !defined(__DragonFly__) && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__APPLE__) && !defined(_WIN32) && !defined(__CYGWIN__) && !defined(__sun) && !defined(__GNU__) && !defined(__FreeBSD_kernel__)
diff --git a/miniupnpc/miniupnpc_socketdef.h b/miniupnpc/miniupnpc_socketdef.h
index 965d915..d4f79a7 100644
--- a/miniupnpc/miniupnpc_socketdef.h
+++ b/miniupnpc/miniupnpc_socketdef.h
@@ -28,6 +28,13 @@
 
 #endif
 
+#ifdef _MSC_VER
+#define MSC_CAST_INT (int)
+#else
+#define MSC_CAST_INT
+#endif
+
+/* definition of PRINT_SOCKET_ERROR */
 #ifdef _WIN32
 #define PRINT_SOCKET_ERROR(x)    fprintf(stderr, "Socket error: %s, %d\n", x, WSAGetLastError());
 #else