diff --git a/src/mesh/udp/UdpMulticastThread.h b/src/mesh/udp/UdpMulticastThread.h
index e2c3be369..7067cced9 100644
--- a/src/mesh/udp/UdpMulticastThread.h
+++ b/src/mesh/udp/UdpMulticastThread.h
@@ -83,4 +83,4 @@ class UdpMulticastThread : public concurrency::OSThread
     IPAddress udpIpAddress;
     AsyncUDP udp;
 };
-#endif // ARCH_ESP32
\ No newline at end of file
+#endif // HAS_UDP_MULTICAST
\ No newline at end of file
diff --git a/variants/rpipico2w/platformio.ini b/variants/rpipico2w/platformio.ini
index 351774221..282be1a42 100644
--- a/variants/rpipico2w/platformio.ini
+++ b/variants/rpipico2w/platformio.ini
@@ -23,8 +23,9 @@ build_flags = ${rp2350_base.build_flags}
   -DHAS_WIFI=1
   -L "${platformio.libdeps_dir}/${this.__env__}/bsec2/src/cortex-m33"
   -fexceptions  # for exception handling in MQTT
+  -DHAS_UDP_MULTICAST=1
 build_src_filter = ${rp2350_base.build_src_filter} +<mesh/wifi/>
 lib_deps =
   ${rp2350_base.lib_deps}
   ${networking_base.lib_deps}
-debug_build_flags = ${rp2350_base.build_flags}, -g
\ No newline at end of file
+debug_build_flags = ${rp2350_base.build_flags}, -g
diff --git a/variants/rpipicow/platformio.ini b/variants/rpipicow/platformio.ini
index 7a43ece3b..4b714434a 100644
--- a/variants/rpipicow/platformio.ini
+++ b/variants/rpipicow/platformio.ini
@@ -10,9 +10,10 @@ build_flags = ${rp2040_base.build_flags}
   -DHW_SPI1_DEVICE
   -L "${platformio.libdeps_dir}/${this.__env__}/bsec2/src/cortex-m0plus"
   -fexceptions  # for exception handling in MQTT
+  -DHAS_UDP_MULTICAST=1
 build_src_filter = ${rp2040_base.build_src_filter} +<mesh/wifi/>
 lib_deps =
   ${rp2040_base.lib_deps}
   ${networking_base.lib_deps}
 debug_build_flags = ${rp2040_base.build_flags}, -g
-debug_tool = cmsis-dap ; for e.g. Picotool
\ No newline at end of file
+debug_tool = cmsis-dap ; for e.g. Picotool