diff --git a/servers/slapd/back-ldbm/backldbm.dsp b/servers/slapd/back-ldbm/backldbm.dsp
index 5aeb74523d..9ac6217424 100644
--- a/servers/slapd/back-ldbm/backldbm.dsp
+++ b/servers/slapd/back-ldbm/backldbm.dsp
@@ -244,6 +244,10 @@ SOURCE=".\proto-back-ldbm.h"
 # End Source File
 # Begin Source File
 
+SOURCE=.\referral.c
+# End Source File
+# Begin Source File
+
 SOURCE=.\search.c
 # End Source File
 # Begin Source File