diff --git a/pgbuild.sh b/pgbuild.sh
deleted file mode 100755
index 9d4c0baa65..0000000000
--- a/pgbuild.sh
+++ /dev/null
@@ -1,33 +0,0 @@
-#!/bin/sh
-#
-#   Purpose of this script is to build and install postgres in a local directory
-# so that zenith intergation tests would find pg binaries and support files.
-#
-# ./pgbuild.sh would do following:
-#
-#   1) run out-of-source build of postgres in REPO_ROOT/tmp_install/build directory (I'm reusing
-#  tmp_install path here since it is already present in .gitignore)
-#
-#   2) installs postgres to REPO_ROOT/tmp_install/
-#
-
-# Halt immediately if any command fails
-set -e
-
-REPO_ROOT=$(dirname "$0")
-REPO_ROOT="`( cd \"$REPO_ROOT\" && pwd )`"
-
-# configure
-echo "Configuring postgres build"
-mkdir -p $REPO_ROOT/tmp_install/build
-cd $REPO_ROOT/tmp_install/build
-../../vendor/postgres/configure CFLAGS='-O0' --enable-debug --enable-cassert \
-    --enable-depend --with-libxml --prefix=/ > configure.log
-
-# compile
-echo "Compiling postgres"
-make -j8 -s
-export DESTDIR=$REPO_ROOT/tmp_install
-
-echo "Installing postgres to $DESTDIR"
-make install -s
diff --git a/zenith_utils/src/lsn.rs b/zenith_utils/src/lsn.rs
index 35ba53cd15..42cb6c46c3 100644
--- a/zenith_utils/src/lsn.rs
+++ b/zenith_utils/src/lsn.rs
@@ -244,5 +244,8 @@ mod tests {
         assert_eq!(lsn.load(), Lsn(1234));
         lsn.store(Lsn(5678));
         assert_eq!(lsn.load(), Lsn(5678));
+
+        assert_eq!(lsn.fetch_max(Lsn(6000)), Lsn(5678));
+        assert_eq!(lsn.fetch_max(Lsn(5000)), Lsn(6000));
     }
 }