diff --git a/configure.ac b/configure.ac
index 020f2f9..eeee355 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,7 +29,7 @@
 
 AC_PREFIX_DEFAULT(/opt/ltp)
 
-AC_CHECK_HEADERS_ONCE([ \
+AC_CHECK_HEADERS([ \
     dmapi.h \
     ifaddrs.h \
     libaio.h \