[master] another compilation fix

diff --git a/src/lib/dhcpsrv/cfg_mac_source.h b/src/lib/dhcpsrv/cfg_mac_source.h
index 6d04cda513539b369f6416717da05aef65df363c..4a00b896404c3b16da87495cb73390adfa40f9c4 100644 (file)
--- a/src/lib/dhcpsrv/cfg_mac_source.h
+++ b/src/lib/dhcpsrv/cfg_mac_source.h
@@ -17,6 +17,7 @@
 
 #include <stdint.h>
 #include <vector>
+#include <string>
 
 namespace isc {
 namespace dhcp {