diff --git a/configure.ac b/configure.ac
index 4248caaef1..603dbe00bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -953,6 +953,7 @@ AC_CHECK_LIB([sec], [fgetspent], [
 
 AC_CHECK_DECLS(getloadavg)
 AC_FUNC_GETLOADAVG
+AC_FUNC_ALLOCA
 
 AC_C_BIGENDIAN
 AC_CHECK_HEADERS([endian.h])