diff --git a/peerconnection/samples/server/main.cc b/peerconnection/samples/server/main.cc
index 1c46ce283..c1c328dea 100644
--- a/peerconnection/samples/server/main.cc
+++ b/peerconnection/samples/server/main.cc
@@ -19,7 +19,7 @@
 #include "peerconnection/samples/server/peer_channel.h"
 #include "peerconnection/samples/server/utils.h"
 
-static const int kMaxConnections = (FD_SETSIZE - 2);
+static const size_t kMaxConnections = (FD_SETSIZE - 2);
 
 void HandleBrowserRequest(DataSocket* ds, bool* quit) {
   assert(ds && ds->valid());
diff --git a/peerconnection/samples/server/peer_channel.cc b/peerconnection/samples/server/peer_channel.cc
index 1c8cf987f..07b66bc18 100644
--- a/peerconnection/samples/server/peer_channel.cc
+++ b/peerconnection/samples/server/peer_channel.cc
@@ -160,7 +160,7 @@ ChannelMember* PeerChannel::Lookup(DataSocket* ds) const {
   static const char* kRequests[] = {
     "/wait", "/sign_out", "/message",
   };
-  int i = 0;
+  size_t i = 0;
   for (; i < ARRAYSIZE(kRequests); ++i) {
     if (ds->PathEquals(kRequests[i]))
       break;
@@ -228,7 +228,7 @@ bool PeerChannel::AddMember(DataSocket* ds) {
   HandleDeliveryFailures(&failures);
   members_.push_back(new_guy);
 
-  printf("New member added (total=%i): %s\n",
+  printf("New member added (total=%lu): %s\n",
       members_.size(), new_guy->name().c_str());
 
   // Let the newly connected peer know about other members of the channel.
@@ -261,7 +261,7 @@ void PeerChannel::OnClosing(DataSocket* ds) {
         break;
     }
   }
-  printf("Total connected: %i\n", members_.size());
+  printf("Total connected: %lu\n", members_.size());
 }
 
 void PeerChannel::CheckForTimeout() {