diff --git a/configure.ac b/configure.ac
index 137323c1a..8a7b9b23e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,7 +80,7 @@ AC_SUBST(with_pg_version_check)
 
 if test "$with_pg_version_check" = no; then
     AC_MSG_NOTICE([building against PostgreSQL $version_num (skipped compatibility check)])
-elif test "$version_num" != '15' -a  "$version_num" != '16' -a  "$version_num" != '17'; then
+elif test "$version_num" != '15' -a  "$version_num" != '16' -a  "$version_num" != '17' -a  "$version_num" != '18'; then
    AC_MSG_ERROR([Citus is not compatible with the detected PostgreSQL version ${version_num}.])
 else
    AC_MSG_NOTICE([building against PostgreSQL $version_num])