diff --git a/modules/netstat/netstat_darwin.go b/modules/netstat/netstat_darwin.go
index 1ef97e1f..0fdbbdd9 100644
--- a/modules/netstat/netstat_darwin.go
+++ b/modules/netstat/netstat_darwin.go
@@ -173,3 +173,9 @@ func HasListeningPort(port string) (found bool, elements []element, err error) {
 	err = fmt.Errorf("HasListeningPort() is not implemented on %s", runtime.GOOS)
 	return
 }
+
+func HasSeenIP(val string) (found bool, elements []element, err error) {
+	// XXX Currently not implemented for darwin.
+	err = fmt.Errorf("HasSeenIP(): operation is not implemented on darwin")
+	return
+}
diff --git a/modules/netstat/netstat_windows.go b/modules/netstat/netstat_windows.go
index d326b5e0..00d37203 100644
--- a/modules/netstat/netstat_windows.go
+++ b/modules/netstat/netstat_windows.go
@@ -72,3 +72,9 @@ func HasListeningPort(port string) (found bool, elements []element, err error) {
 	err = fmt.Errorf("HasListeningPort() is not implemented on %s", runtime.GOOS)
 	return
 }
+
+func HasSeenIP(val string) (found bool, elements []element, err error) {
+	// XXX Currently not implemented for windows.
+	err = fmt.Errorf("HasSeenIP(): operation is not implemented on windows")
+	return
+}