diff --git a/tests/Makefile.am b/tests/Makefile.am
index 5636549..465c249 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -7,5 +7,5 @@ TESTS          += pidfile_func
 check_PROGRAMS  = $(TESTS)
 
 # Ignore warnings about unused result, in e.g. write()
-CFLAGS          = -Wno-unused-result
+CFLAGS          = -W -Wall -Wextra -Wno-unused-result
 LDADD           = -L../ ../libite.la