diff --git a/gnulib-tests/Makefile.am b/gnulib-tests/Makefile.am
index edaa0a726..05107d141 100644
--- a/gnulib-tests/Makefile.am
+++ b/gnulib-tests/Makefile.am
@@ -1,7 +1,7 @@
-include gnulib.mk
-
 AM_CFLAGS = $(GNULIB_TEST_WARN_CFLAGS) $(WERROR_CFLAGS)
 
+include gnulib.mk
+
 # A few tests are inherently warning-evoking.
 # In the typical case where we use -Werror, exempt the few offenders.