diff --git a/testsuite/Makefile.am b/testsuite/Makefile.am
index 8c6cd2bea8cd53ddd6d7a5f0144655a4392ef252..7f1da5e9c43ee990fb955060994e599e6c10f53b 100644
--- a/testsuite/Makefile.am
+++ b/testsuite/Makefile.am
@@ -7,17 +7,20 @@ TS_PROGS = aes-test arcfour-test blowfish-test cast128-test \
 	   serpent-test twofish-test \
 	   cbc-test
 
+M4_FILES = aes-test.m4 arcfour-test.m4 blowfish-test.m4 cast128-test.m4 \
+	   des-test.m4 des3-test.m4 \
+	   md5-test.m4 md5-compat-test.m4 sha1-test.m4 \
+	   serpent-test.m4 twofish-test.m4 \
+	   cbc-test.m4
+
 noinst_PROGRAMS = $(TS_PROGS)
 
 LDADD = testutils.o ../libnettle.a
-EXTRA_DIST = $(SOURCES:.c=.m4) testutils.c testutils.h run-tests
-
-des-compat-test.c:
-	true
+EXTRA_DIST = $(M4_FILES) macros.m4 testutils.c testutils.h run-tests
 
 M4FLAGS = -P -s
 # M4FLAGS = -P
-%.c: macros.m4 %.m4
+$(M4_FILES:.m4=.c): %.c: macros.m4 %.m4
 	$(M4) $(M4FLAGS) $^ > $@T
 	test -s $@T && mv -f $@T $@