diff --git a/configure.ac b/configure.ac
index 02451bf..b14fe8e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,6 +10,8 @@ AC_PROG_RANLIB
 AC_PROG_LN_S
 AC_PROG_INSTALL
 
+CFLAGS="$CFLAGS -Wall"
+
 BUILDSYS_SHARED_LIB
 BUILDSYS_INIT
 BUILDSYS_TOUCH_DEPS