diff --git a/pcsx2/DEV9/pcap_io.cpp b/pcsx2/DEV9/pcap_io.cpp
index c257c8f6fa..df76595a27 100644
--- a/pcsx2/DEV9/pcap_io.cpp
+++ b/pcsx2/DEV9/pcap_io.cpp
@@ -321,11 +321,10 @@ bool PCAPAdapter::InitPCAP(const std::string& adapter, bool promiscuous)
 bool PCAPAdapter::SetMACSwitchedFilter(MAC_Address mac)
 {
 	bpf_program fp;
-	char filter[1024] = "ether broadcast or ether dst ";
 
-	char virtual_mac_str[18];
-	sprintf(virtual_mac_str, "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac.bytes[0], mac.bytes[1], mac.bytes[2], mac.bytes[3], mac.bytes[4], mac.bytes[5]);
-	strcat(filter, virtual_mac_str);
+	char filter[128];
+	std::snprintf(filter, std::size(filter), "ether broadcast or ether dst %.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
+		mac.bytes[0], mac.bytes[1], mac.bytes[2], mac.bytes[3], mac.bytes[4], mac.bytes[5]);
 
 	if (pcap_compile(hpcap, &fp, filter, 1, PCAP_NETMASK_UNKNOWN) == -1)
 	{