diff --git a/airpcap_loader.c b/airpcap_loader.c
index 1e37cb6c18..e01b6bc792 100644
--- a/airpcap_loader.c
+++ b/airpcap_loader.c
@@ -1138,7 +1138,10 @@ get_airpcap_interface_list(int *err, char **err_str)
     char errbuf[PCAP_ERRBUF_SIZE];
 
     if (!AirpcapLoaded)
+    {
+	*err = AIRPCAP_NOT_LOADED;
 	return il;
+    }
 
     if (!g_PAirpcapGetDeviceList(&devsList, errbuf))
     {
diff --git a/airpcap_loader.h b/airpcap_loader.h
index 420eb032cd..da345e247a 100644
--- a/airpcap_loader.h
+++ b/airpcap_loader.h
@@ -33,6 +33,7 @@
 /* Error values from "get_airpcap_interface_list()". */
 #define	CANT_GET_AIRPCAP_INTERFACE_LIST	0	/* error getting list */
 #define	NO_AIRPCAP_INTERFACES_FOUND	1	/* list is empty */
+#define AIRPCAP_NOT_LOADED		2	/* Airpcap DLL not loaded */
 
 #define AIRPCAP_CHANNEL_ANY_NAME "ANY"