diff --git a/dlls/wpcap/wpcap.c b/dlls/wpcap/wpcap.c
index 90b0647a8ca..da545a81f25 100644
--- a/dlls/wpcap/wpcap.c
+++ b/dlls/wpcap/wpcap.c
@@ -116,6 +116,12 @@ int CDECL wine_pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
     return ret;
 }
 
+int CDECL wine_pcap_findalldevs_ex(char *source, void *auth, pcap_if_t **alldevs, char *errbuf)
+{
+    FIXME("(%s %p %p %p): partial stub\n", debugstr_a(source), auth, alldevs, errbuf);
+    return wine_pcap_findalldevs(alldevs, errbuf);
+}
+
 void CDECL wine_pcap_freealldevs(pcap_if_t *alldevs)
 {
     TRACE("(%p)\n", alldevs);
diff --git a/dlls/wpcap/wpcap.spec b/dlls/wpcap/wpcap.spec
index 540089dfc78..c7d2cd1e413 100644
--- a/dlls/wpcap/wpcap.spec
+++ b/dlls/wpcap/wpcap.spec
@@ -25,7 +25,7 @@
 @ stub pcap_file
 @ stub pcap_fileno
 @ cdecl pcap_findalldevs(ptr ptr) wine_pcap_findalldevs
-@ stub pcap_findalldevs_ex
+@ cdecl pcap_findalldevs_ex(ptr ptr ptr ptr) wine_pcap_findalldevs_ex
 @ cdecl pcap_freealldevs(ptr) wine_pcap_freealldevs
 @ cdecl pcap_freecode(ptr) wine_pcap_freecode
 @ cdecl pcap_get_airpcap_handle(ptr) wine_pcap_get_airpcap_handle