diff --git a/mu/tests/Makefile.am b/mu/tests/Makefile.am
index d95b2bcc..645cf517 100644
--- a/mu/tests/Makefile.am
+++ b/mu/tests/Makefile.am
@@ -36,10 +36,10 @@ AM_CPPFLAGS=$(XAPIAN_CXXFLAGS)						\
 AM_CFLAGS=								\
 	$(ASAN_CFLAGS)							\
 	${WARN_CFLAGS}
+
 AM_CXXFLAGS=								\
 	$(ASAN_CFLAGS)							\
-	${WARN_CFLAGS}
-${WARN_CXXFLAGS}
+	${WARN_CXXFLAGS}
 
 AM_LDFLAGS=								\
 	$(ASAN_LDFLAGS)