diff --git a/configure.ac b/configure.ac
index 69bf447..3b342f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,6 +16,7 @@ ACLOCAL="$ACLOCAL -I m4"
 AM_MAINTAINER_MODE
 
 AC_PROG_CC
+AM_PROG_CC_C_O
 AC_PROG_CC_STDC
 AC_ISC_POSIX
 AM_PROG_LEX