diff --git a/configure.ac b/configure.ac
index fafb0d18e169ff73e36c9542fea0b83b706646a4..795a013a5f367f891a23a4d6f61de853d3988124 100644
--- a/configure.ac
+++ b/configure.ac
@@ -73,7 +73,7 @@ if test $with_elan; then
 fi
 
 dnl Checks for header files.
-AC_CHECK_HEADERS(popt.h mcheck.h values.h)
+AC_CHECK_HEADERS(popt.h mcheck.h values.h socket.h sys/socket.h)
 AC_HEADER_SYS_WAIT
 AC_HEADER_TIME
 AC_HEADER_STDC