diff --git a/configure.ac b/configure.ac
index c7b2a73..4cfc3d2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,6 +27,7 @@ AC_USE_SYSTEM_EXTENSIONS
 AC_PROG_CC
 AC_PROG_CC_C99
 AM_PROG_CC_C_O
+AC_PROG_SED
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 
 LT_PREREQ(2.2)