diff --git a/src/PeerInteractionCommand.cc b/src/PeerInteractionCommand.cc
index e04d93d4..64f83fc6 100644
--- a/src/PeerInteractionCommand.cc
+++ b/src/PeerInteractionCommand.cc
@@ -170,7 +170,7 @@ void PeerInteractionCommand::checkLongTimePeerChoking() {
     }
   } else {
     if(peer->amInterested && peer->peerChoking) {
-      if(Util::difftv(now, chokeCheckPoint) >= 3*60*1000000) {
+      if(Util::difftv(now, chokeCheckPoint) >= MAX_PEER_CHOKING_INTERVAL*1000000) {
 	throw new DlAbortEx("too long choking");
       }
     } else {
diff --git a/src/PeerInteractionCommand.h b/src/PeerInteractionCommand.h
index 72488391..24e7057e 100644
--- a/src/PeerInteractionCommand.h
+++ b/src/PeerInteractionCommand.h
@@ -28,6 +28,8 @@
 
 using namespace std;
 
+#define MAX_PEER_CHOKING_INTERVAL (3*60)
+
 class PeerInteractionCommand : public PeerAbstractCommand {
 private:
   int sequence;