diff --git a/tests/022-large-file b/tests/022-large-file
new file mode 100644
index 0000000..485f587
--- /dev/null
+++ b/tests/022-large-file
@@ -0,0 +1,79 @@
+#!/bin/sh
+#
+# Make sure that files larger than 2GB are supported.
+
+# Check there is enough free space for this test.
+TMP1DIR="${TMP1%/*}"
+TMP1SPACEKB=$(df -kP "${TMP1DIR}" | sed -n '$p' | awk '{print $(NF-2)}')
+test -n "${TMP1SPACEKB}" || TMP1SPACEKB=0
+if ! test "${TMP1SPACEKB}" -gt 3300000 2>/dev/null; then
+	echo "need >3GB free on ${TMP1DIR}"
+	exit 2
+fi
+
+# Generate a 3GB sparse file - we don't really need 3GB of free space unless
+# sparse files are not supported.
+echo -n > "${TMP1}"
+if ! dd if="/dev/zero" of="${TMP1}" count=1 bs=1048576 seek=3072 2>/dev/null; then
+	echo "failed to create 3GB specimen file"
+	exit 2
+fi
+
+# NB the "stat" command is not portable - BSD stat(1) has a different syntax
+# to GNU stat(1) - so we have to parse the output of ls(1).
+FILESIZE=$(ls -nl "${TMP1}" 2>/dev/null | awk '{print $5}')
+test -n "${FILESIZE}" || FILESIZE=0
+if ! test "${FILESIZE}" -gt 3000000; then
+	echo "failed to validate specimen file size"
+	exit 2
+fi
+
+# Transfer the file, and count how many bytes came through.
+TRANSFERRED=$("${PROG}" -n -b "${TMP1}" 2>"${TMP2}" | wc -c 2>/dev/null | tr -dc '0-9')
+test -n "${TRANSFERRED}" || TRANSFERRED=0
+COUNTED=$(sed -n '$p' "${TMP2}" | tr -dc '0-9')
+test -n "${COUNTED}" || COUNTED=0
+if ! test "${TRANSFERRED}" -eq "${FILESIZE}"; then
+	echo "transferred ${TRANSFERRED} of ${FILESIZE} bytes"
+	exit 1
+fi
+if ! test "${COUNTED}" -eq "${FILESIZE}"; then
+	echo "counted ${TRANSFERRED} of ${FILESIZE} bytes"
+	exit 1
+fi
+
+# Transfer the file from stdin, and count how many bytes came through.
+TRANSFERRED=$("${PROG}" -n -b < "${TMP1}" 2>"${TMP2}" | wc -c 2>/dev/null | tr -dc '0-9')
+test -n "${TRANSFERRED}" || TRANSFERRED=0
+COUNTED=$(sed -n '$p' "${TMP2}" | tr -dc '0-9')
+test -n "${COUNTED}" || COUNTED=0
+if ! test "${TRANSFERRED}" -eq "${FILESIZE}"; then
+	echo "stdin - transferred ${TRANSFERRED} of ${FILESIZE} bytes"
+	exit 1
+fi
+if ! test "${COUNTED}" -eq "${FILESIZE}"; then
+	echo "stdin - counted ${TRANSFERRED} of ${FILESIZE} bytes"
+	exit 1
+fi
+
+# Use the file as a size value and transfer its size of bytes from dev/zero,
+# and count how many bytes came through.
+TRANSFERRED=$("${PROG}" -n -b -S -s "@${TMP1}" /dev/zero 2>"${TMP2}" | wc -c 2>/dev/null | tr -dc '0-9')
+test -n "${TRANSFERRED}" || TRANSFERRED=0
+COUNTED=$(sed -n '$p' "${TMP2}" | tr -dc '0-9')
+test -n "${COUNTED}" || COUNTED=0
+if ! test "${TRANSFERRED}" -eq "${FILESIZE}"; then
+	echo "size read - transferred ${TRANSFERRED} of ${FILESIZE} bytes"
+	exit 1
+fi
+if ! test "${COUNTED}" -eq "${FILESIZE}"; then
+	echo "size read - counted ${COUNTED} of ${FILESIZE} bytes"
+	exit 1
+fi
+
+echo -n > "${TMP1}"
+echo -n > "${TMP2}"
+
+exit 0
+
+# EOF