diff --git a/test/zdtm/Makefile.inc b/test/zdtm/Makefile.inc
index 9b758c339..5e8836e90 100644
--- a/test/zdtm/Makefile.inc
+++ b/test/zdtm/Makefile.inc
@@ -1,3 +1,4 @@
+.SUFFIXES:
 MAKEFLAGS	+= -r
 
 ARCH ?= $(shell uname -m | sed          \