diff --git a/Makefile.inc1 b/Makefile.inc1
index 4a22e3622da4..2064b05abca2 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -264,7 +264,9 @@ update:
 	@echo "--------------------------------------------------------------"
 	@echo ">>> Running ${SUP}"
 	@echo "--------------------------------------------------------------"
+.if defined(SUPFILE)
 	@${SUP} ${SUPFLAGS} ${SUPFILE}
+.endif
 .if defined(SUPFILE1)
 	@${SUP} ${SUPFLAGS} ${SUPFILE1}
 .endif