diff --git a/testsuite/Makefile.am b/testsuite/Makefile.am
index af607e3e9c7ee7980dc036744591b241b713d697..0e9e234248be9de0675a19ea42fcea10183f434a 100644
--- a/testsuite/Makefile.am
+++ b/testsuite/Makefile.am
@@ -1,5 +1,4 @@
-CFLAGS = -I$(top_srcdir) @CFLAGS@
-CPPFLAGS = @CPPFLAGS@
+AM_CPPFLAGS = -I$(top_srcdir)
 
 TS_PROGS = aes-test arcfour-test blowfish-test cast128-test \
            base64-test \