diff --git a/configure.in b/configure.in
index 70dc29cd..a69650f6 100644
--- a/configure.in
+++ b/configure.in
@@ -35,6 +35,7 @@ esac
 dnl Checks for programs.
 AC_PROG_CC
 AM_PROG_CC_C_O
+AC_PROG_SED
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MKDIR_P