diff --git a/configure.ac b/configure.ac
index 81f7d9c0..79e8077b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -14,7 +14,6 @@ AC_SUBST(ISODATE)
 
 LX_CFLAGS=${CFLAGS-NONE}
 AC_PROG_CC_C99
-AM_PROG_CC_C_O
 AC_USE_SYSTEM_EXTENSIONS
 CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"