diff --git a/configure.ac b/configure.ac
index 19780be..969e171 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,7 @@ AC_USE_SYSTEM_EXTENSIONS
 AC_PROG_CC
 AC_PROG_CC_C99
 AM_PROG_CC_C_O
-AM_PROG_AR
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 
 LT_PREREQ(2.2)
 LT_INIT