diff --git a/src/Makefile.am b/src/Makefile.am
index 7c404b33d4..680101f8a2 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1759,6 +1759,7 @@ virtlockd_SOURCES = \
 virtlockd_CFLAGS = \
 		$(AM_CFLAGS) \
 		$(PIE_CFLAGS) \
+		$(XDR_CFLAGS) \
 		$(NULL)
 virtlockd_LDFLAGS = \
 		$(AM_LDFLAGS) \