diff --git a/libtransmission/natpmp.c b/libtransmission/natpmp.c
index 0508de189..2b1806646 100644
--- a/libtransmission/natpmp.c
+++ b/libtransmission/natpmp.c
@@ -41,7 +41,6 @@
 #include "utils.h"
 
 #define PMP_PORT                5351
-#define PMP_MCAST_ADDR          "224.0.0.1"
 #define PMP_INITIAL_DELAY       250     /* ms, 1/4 second */
 #define PMP_TOTAL_DELAY         120000  /* ms, 2 minutes */
 #define PMP_VERSION             0
diff --git a/libtransmission/natpmp.h b/libtransmission/natpmp.h
index 460f226f3..4dab5abef 100644
--- a/libtransmission/natpmp.h
+++ b/libtransmission/natpmp.h
@@ -36,4 +36,6 @@ void        tr_natpmpRemoveForwarding( tr_natpmp * );
 void        tr_natpmpPulse( tr_natpmp *, int * );
 void        tr_natpmpClose( tr_natpmp * );
 
+#define PMP_MCAST_ADDR "224.0.0.1"
+
 #endif
diff --git a/libtransmission/net.c b/libtransmission/net.c
index 3d3854d63..0c83d4feb 100644
--- a/libtransmission/net.c
+++ b/libtransmission/net.c
@@ -40,6 +40,7 @@
 
 #include "transmission.h"
 #include "fdlimit.h"
+#include "natpmp.h"
 #include "net.h"
 #include "platform.h"
 #include "utils.h"
@@ -217,7 +218,7 @@ tr_netBind( int port, int type )
      * This can probably be done cleaner, but since we're only using SOCK_DGRAM
      * for nat-pmp, this quick fix should work. */
     if ( SOCK_DGRAM == type )
-        sock.sin_addr.s_addr = inet_addr("224.0.0.1");
+        sock.sin_addr.s_addr = inet_addr( PMP_MCAST_ADDR );
     else
         sock.sin_addr.s_addr = INADDR_ANY;