diff --git a/src/conn.cpp b/src/conn.cpp
index 6348c98..3fa6118 100644
--- a/src/conn.cpp
+++ b/src/conn.cpp
@@ -48,7 +48,7 @@ size_t ConnBase::enqueueTxBody(pva_app_msg_t cmd)
                         uint32_t(blen)},
              hostBE);
     auto err = evbuffer_add_buffer(tx, txBody.get());
-    assert(!err);
+    assert(!err); // could only fail if frozen/pinned, which is not the case
     statTx += 8u + blen;
     return 8u + blen;
 }
diff --git a/src/os/default/osdSockExt.cpp b/src/os/default/osdSockExt.cpp
index af4486c..cc1d7f0 100644
--- a/src/os/default/osdSockExt.cpp
+++ b/src/os/default/osdSockExt.cpp
@@ -149,7 +149,7 @@ int recvfromx::call()
 
     if(ret>=0) { // on success, check for control messages
         if(msg.msg_flags & MSG_CTRUNC)
-            log_warn_printf(log, "MSG_CTRUNC, expand buffer %zu <- %zu\n", msg.msg_controllen, sizeof(cbuf));
+            log_warn_printf(log, "MSG_CTRUNC, expand buffer %zu <- %zu\n", size_t(msg.msg_controllen), sizeof(cbuf));
 
         for(cmsghdr *hdr = CMSG_FIRSTHDR(&msg); hdr ; hdr = CMSG_NXTHDR(&msg, hdr)) {
             if(0) {}
diff --git a/src/udp_collector.h b/src/udp_collector.h
index e3622df..8958e47 100644
--- a/src/udp_collector.h
+++ b/src/udp_collector.h
@@ -93,8 +93,6 @@ private:
 
 class PVXS_API UDPListener
 {
-    friend struct UDPManager;
-
     std::function<void(UDPManager::Search&)> searchCB;
     std::function<void(UDPManager::Beacon&)> beaconCB;
     const std::shared_ptr<UDPManager::Pvt> manager;