diff --git a/lib/Makefile.vc6 b/lib/Makefile.vc6
index f2d441822a..2a80fc406e 100644
--- a/lib/Makefile.vc6
+++ b/lib/Makefile.vc6
@@ -542,6 +542,7 @@ X_OBJS= \
 	$(DIROBJ)\curl_ntlm_wb.obj \
 	$(DIROBJ)\curl_rtmp.obj \
 	$(DIROBJ)\curl_sasl.obj \
+	$(DIROBJ)\curl_sasl_sspi.obj \
 	$(DIROBJ)\curl_schannel.obj \
 	$(DIROBJ)\curl_sspi.obj \
 	$(DIROBJ)\curl_threads.obj \