diff --git a/src/evhelper.cpp b/src/evhelper.cpp
index b914f85..98ee4c1 100644
--- a/src/evhelper.cpp
+++ b/src/evhelper.cpp
@@ -366,6 +366,7 @@ bool evbase::assertInRunningLoop() const
 }
 
 bool evsocket::canIPv6;
+evsocket::ipstack_t evsocket::ipstack;
 
 evsocket::evsocket(int af, evutil_socket_t sock)
     :sock(sock)
diff --git a/src/evhelper.h b/src/evhelper.h
index 5f463df..b1f8370 100644
--- a/src/evhelper.h
+++ b/src/evhelper.h
@@ -251,6 +251,13 @@ struct PVXS_API evsocket
     bool canIPv6;
 
     static bool init_canIPv6();
+
+    enum ipstack_t {
+        Linsock,
+        Winsock,
+        GenericBSD,
+    };
+    static ipstack_t ipstack;
 };
 
 struct PVXS_API IfaceMap {
diff --git a/src/os/WIN32/osdSockExt.cpp b/src/os/WIN32/osdSockExt.cpp
index 4c120be..d56ca2e 100644
--- a/src/os/WIN32/osdSockExt.cpp
+++ b/src/os/WIN32/osdSockExt.cpp
@@ -19,6 +19,16 @@
 #include <epicsThread.h>
 #include <cantProceed.h>
 
+#  include <windows.h>
+#  include <psapi.h>
+
+static
+bool is_wine()
+{
+    HMODULE nt = GetModuleHandle("ntdll.dll");
+    return nt && GetProcAddress(nt, "wine_get_version");
+}
+
 namespace pvxs {
 
 DEFINE_LOGGER(log, "pvxs.util");
@@ -48,6 +58,7 @@ void oseDoOnce(void*)
         cantProceed("Unable to get &WSARecvMsg!!");
 
     evsocket::canIPv6 = evsocket::init_canIPv6();
+    evsocket::ipstack = is_wine() ? evsocket::Linsock : evsocket::Winsock;
 }
 
 void osiSockAttachExt()
diff --git a/src/os/default/osdSockExt.cpp b/src/os/default/osdSockExt.cpp
index 8a68435..af4486c 100644
--- a/src/os/default/osdSockExt.cpp
+++ b/src/os/default/osdSockExt.cpp
@@ -44,6 +44,12 @@ static
 void oseDoOnce(void*)
 {
     evsocket::canIPv6 = evsocket::init_canIPv6();
+#ifdef __linux__
+    // TODO: detect WSL1 somehow.  (Is WSL2 really Linux IP stack?)
+    evsocket::ipstack = evsocket::Linsock;
+#else
+    evsocket::ipstack = evsocket::GenericBSD;
+#endif
 }
 
 void osiSockAttachExt() {
diff --git a/src/server.cpp b/src/server.cpp
index 894ba57..e95d171 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -416,8 +416,8 @@ Server::Pvt::Pvt(const Config &conf)
             listeners.push_back(manager.onSearch(any6, cb));
         }
 
-#ifndef _WIN32
-        if(addr.addr.family()==AF_INET && !addr.addr.isAny() && !addr.addr.isMCast()) {
+        if(evsocket::ipstack!=evsocket::Winsock
+                && addr.addr.family()==AF_INET && !addr.addr.isAny() && !addr.addr.isMCast()) {
             /* An oddness of BSD sockets (not winsock) is that binding to
              * INADDR_ANY will receive unicast and broadcast, but binding to
              * a specific interface address receives only unicast.  The trick
@@ -429,7 +429,6 @@ Server::Pvt::Pvt(const Config &conf)
                 listeners.push_back(manager.onSearch(bcast, cb));
             }
         }
-#endif
     }
 
     if(tcpifaces.empty()) {
diff --git a/test/testsock.cpp b/test/testsock.cpp
index 28f2f9b..26d712f 100644
--- a/test/testsock.cpp
+++ b/test/testsock.cpp
@@ -19,18 +19,6 @@
 #include <pvxs/unittest.h>
 #include <pvxs/log.h>
 
-#ifdef _WIN32
-#  include <windows.h>
-#  include <psapi.h>
-
-static
-bool is_wine()
-{
-    HMODULE nt = GetModuleHandle("ntdll.dll");
-    return nt && GetProcAddress(nt, "wine_get_version");
-}
-#endif
-
 namespace {
 using namespace pvxs;
 
@@ -236,11 +224,11 @@ void test_mcast_scope()
     testShow()<<" RX2 bound to "<<any;
     RX3.bind(lo);
     testShow()<<" RX3 bound to "<<lo;
-#ifndef _WIN32
-    // winsock doesn't allow binding to an mcast address
-    RX4.bind(mcast_addr.addr);
-    testShow()<<" RX4 bound to "<<mcast_addr;
-#endif
+    if(evsocket::ipstack!=evsocket::Winsock) {
+        // winsock doesn't allow binding to an mcast address
+        RX4.bind(mcast_addr.addr);
+        testShow()<<" RX4 bound to "<<mcast_addr;
+    }
 
     testShow()<<" Join RX1 to "<<mcast_addr<<" on "<<lo;
     RX1.mcast_join(mcast_addr.resolve());
@@ -272,7 +260,7 @@ void test_mcast_scope()
 
 #ifdef _WIN32
     doRX(1, RX1, true);
-    doRX(2, RX2, is_wine()); // really Linux IP stack, and we couldn't clear IP_MULTICAST_ALL
+    doRX(2, RX2, evsocket::ipstack==evsocket::Linsock); // WINE: really Linux IP stack, but we couldn't clear IP_MULTICAST_ALL
     doRX(3, RX3, false);
     testSkip(3, "winsock doesn't allow bind() to an mcast address");