diff --git a/Documentation/running-tests.md b/Documentation/running-tests.md
index 64aff7c..736ab48 100644
--- a/Documentation/running-tests.md
+++ b/Documentation/running-tests.md
@@ -113,9 +113,10 @@ The NVMe tests can be additionally parameterized via environment variables.
   block device types can be listed with separating spaces. In this case, the
   tests are repeated to cover all of the block device types specified. Default
   value is "device file".
-- nvme_img_size: '1G' (default)
-  Run the tests with given image size in bytes. 'm', 'M', 'g'
-	and 'G' postfix are supported.
+- NVME_IMG_SIZE: '1G' (default)
+  Run the tests with given image size in bytes. 'm', 'M', 'g' and 'G' postfix
+  are supported. This parameter had an old name 'nvme_img_size'. The old name
+  is still usable, but not recommended.
 - nvme_num_iter: 1000 (default)
   The number of iterations a test should do.
 
diff --git a/tests/nvme/010 b/tests/nvme/010
index 9ea2561..d99067a 100755
--- a/tests/nvme/010
+++ b/tests/nvme/010
@@ -32,7 +32,7 @@ test() {
 
 	ns=$(_find_nvme_ns "${def_subsys_uuid}")
 
-	_run_fio_verify_io --size="${nvme_img_size}" \
+	_run_fio_verify_io --size="${NVME_IMG_SIZE}" \
 		--filename="/dev/${ns}"
 
 	_nvme_disconnect_subsys
diff --git a/tests/nvme/017 b/tests/nvme/017
index 9410cdc..4f14471 100755
--- a/tests/nvme/017
+++ b/tests/nvme/017
@@ -25,7 +25,7 @@ test() {
 	local port
 	local iterations="${nvme_num_iter}"
 
-	truncate -s "${nvme_img_size}" "$(_nvme_def_file_path)"
+	truncate -s "${NVME_IMG_SIZE}" "$(_nvme_def_file_path)"
 
 	local genctr=1
 
diff --git a/tests/nvme/031 b/tests/nvme/031
index b98630a..00d3d18 100755
--- a/tests/nvme/031
+++ b/tests/nvme/031
@@ -37,7 +37,7 @@ test() {
 	local loop_dev
 	local port
 
-	truncate -s "${nvme_img_size}" "$(_nvme_def_file_path)"
+	truncate -s "${NVME_IMG_SIZE}" "$(_nvme_def_file_path)"
 
 	loop_dev="$(losetup -f --show "$(_nvme_def_file_path)")"
 
diff --git a/tests/nvme/034 b/tests/nvme/034
index 522ffe3..239757c 100755
--- a/tests/nvme/034
+++ b/tests/nvme/034
@@ -29,7 +29,7 @@ test_device() {
 	_nvmet_passthru_target_setup
 	nsdev=$(_nvmet_passthru_target_connect)
 
-	_run_fio_verify_io --size="${nvme_img_size}" --filename="${nsdev}"
+	_run_fio_verify_io --size="${NVME_IMG_SIZE}" --filename="${nsdev}"
 
 	_nvme_disconnect_subsys
 	_nvmet_passthru_target_cleanup
diff --git a/tests/nvme/035 b/tests/nvme/035
index cfca5fd..8286178 100755
--- a/tests/nvme/035
+++ b/tests/nvme/035
@@ -17,7 +17,7 @@ requires() {
 }
 
 device_requires() {
-	_require_test_dev_size "${nvme_img_size}"
+	_require_test_dev_size "${NVME_IMG_SIZE}"
 }
 
 set_conditions() {
@@ -35,7 +35,7 @@ test_device() {
 	_nvmet_passthru_target_setup
 	nsdev=$(_nvmet_passthru_target_connect)
 
-	if ! _xfs_run_fio_verify_io "${nsdev}" "${nvme_img_size}"; then
+	if ! _xfs_run_fio_verify_io "${nsdev}" "${NVME_IMG_SIZE}"; then
 		echo "FAIL: fio verify failed"
 	fi
 
diff --git a/tests/nvme/rc b/tests/nvme/rc
index a31690d..c018f7f 100644
--- a/tests/nvme/rc
+++ b/tests/nvme/rc
@@ -19,7 +19,7 @@ def_hostnqn="nqn.2014-08.org.nvmexpress:uuid:${def_hostid}"
 export def_subsysnqn="blktests-subsystem-1"
 export def_subsys_uuid="91fdba0d-f87b-4c25-b80f-db7be1418b9e"
 _check_conflict_and_set_default NVMET_TRTYPES nvme_trtype "loop"
-nvme_img_size=${nvme_img_size:-"1G"}
+_check_conflict_and_set_default NVME_IMG_SIZE nvme_img_size 1G
 nvme_num_iter=${nvme_num_iter:-"1000"}
 nvmet_blkdev_type=${nvmet_blkdev_type:-"device"}
 NVMET_BLKDEV_TYPES=${NVMET_BLKDEV_TYPES:-"device file"}
@@ -165,10 +165,10 @@ _require_nvme_test_img_size() {
 	local nvme_img_size_mb
 
 	require_sz_mb="$(convert_to_mb "$1")"
-	nvme_img_size_mb="$(convert_to_mb "${nvme_img_size}")"
+	nvme_img_size_mb="$(convert_to_mb "${NVME_IMG_SIZE}")"
 
 	if ((nvme_img_size_mb < require_sz_mb)); then
-		SKIP_REASONS+=("nvme_img_size must be at least ${require_sz_mb}m")
+		SKIP_REASONS+=("NVME_IMG_SIZE must be at least ${require_sz_mb}m")
 		return 1
 	fi
 	return 0
@@ -915,7 +915,7 @@ _nvmet_target_setup() {
 		esac
 	done
 
-	truncate -s "${nvme_img_size}" "$(_nvme_def_file_path)"
+	truncate -s "${NVME_IMG_SIZE}" "$(_nvme_def_file_path)"
 	if [[ "${blkdev_type}" == "device" ]]; then
 		blkdev="$(losetup -f --show "$(_nvme_def_file_path)")"
 	else
