diff --git a/configure.ac b/configure.ac
index deaa697331ca7e40db6ea4332ff4e766303a3bbd..1c545348aa36ee4d1c7a405750f22a8fb769c394 100644
--- a/configure.ac
+++ b/configure.ac
@@ -112,7 +112,7 @@ dnl Availability of various not common threadsafe functions
 AC_CHECK_FUNCS([strerror_r strtok_r getmntent_r getgrnam_r getpwuid_r])
 
 dnl Availability of various common headers (non-fatal if missing).
-AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/syslimits.h sys/utsname.h
+AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/syslimits.h sys/utsname.h \
   sys/wait.h sched.h termios.h sys/poll.h syslog.h mntent.h net/ethernet.h])
 
 dnl Where are the XDR functions?