diff --git a/mk/win32/re.vcproj b/mk/win32/re.vcproj
index 88c15d4..eac9c25 100644
--- a/mk/win32/re.vcproj
+++ b/mk/win32/re.vcproj
@@ -549,6 +549,12 @@
 				<File
 					RelativePath="..\..\src\sip\dialog.c">
 				</File>
+				<File
+					RelativePath="..\..\src\sip\keepalive.c">
+				</File>
+				<File
+					RelativePath="..\..\src\sip\keepalive_udp.c">
+				</File>
 				<File
 					RelativePath="..\..\src\sip\msg.c">
 				</File>