diff --git a/README.md b/README.md
index cca98cf1..8c662c46 100644
--- a/README.md
+++ b/README.md
@@ -139,6 +139,7 @@ test run has completed. The binary will be run with the following environment
 variables set:
 
 ```
+GOTESTSUM_ELAPSED       # test time elapsed, in seconds
 GOTESTSUM_FORMAT        # gotestsum format (ex: short)
 GOTESTSUM_JSONFILE      # path to the jsonfile, empty if no file path was given
 GOTESTSUM_JUNITFILE     # path to the junit.xml file, empty if no file path was given
@@ -146,7 +147,6 @@ TESTS_ERRORS            # number of errors
 TESTS_FAILED            # number of failed tests
 TESTS_SKIPPED           # number of skipped tests
 TESTS_TOTAL             # number of tests run
-TESTS_ELAPSED           # test time elapsed, in seconds
 ```
 
 To get more details about the test run, such as failure messages or the full list of failed
diff --git a/cmd/handler.go b/cmd/handler.go
index 0820ee68..99fd002d 100644
--- a/cmd/handler.go
+++ b/cmd/handler.go
@@ -170,11 +170,11 @@ func postRunHook(opts *options, execution *testjson.Execution) error {
 		"GOTESTSUM_JSONFILE="+opts.jsonFile,
 		"GOTESTSUM_JSONFILE_TIMING_EVENTS="+opts.jsonFileTimingEvents,
 		"GOTESTSUM_JUNITFILE="+opts.junitFile,
+		fmt.Sprintf("GOTESTSUM_ELAPSED=%.3f", execution.Elapsed().Seconds()),
 		fmt.Sprintf("TESTS_TOTAL=%d", execution.Total()),
 		fmt.Sprintf("TESTS_FAILED=%d", len(execution.Failed())),
 		fmt.Sprintf("TESTS_SKIPPED=%d", len(execution.Skipped())),
 		fmt.Sprintf("TESTS_ERRORS=%d", len(execution.Errors())),
-		fmt.Sprintf("TESTS_ELAPSED=%.3f", execution.Elapsed().Seconds()),
 	)
 	return cmd.Run()
 }
diff --git a/cmd/handler_test.go b/cmd/handler_test.go
index dabefd26..5d55f9d1 100644
--- a/cmd/handler_test.go
+++ b/cmd/handler_test.go
@@ -39,7 +39,7 @@ func TestPostRunHook(t *testing.T) {
 	assert.NilError(t, err)
 
 	actual := text.ProcessLines(t, buf, func(line string) string {
-		if strings.HasPrefix(line, "TESTS_ELAPSED=0.0") {
+		if strings.HasPrefix(line, "GOTESTSUM_ELAPSED=0.0") {
 			i := strings.Index(line, "=")
 			return line[:i] + "=0.000"
 		}
diff --git a/cmd/testdata/post-run-hook-expected b/cmd/testdata/post-run-hook-expected
index 55ea6b5d..a2a6b9e5 100644
--- a/cmd/testdata/post-run-hook-expected
+++ b/cmd/testdata/post-run-hook-expected
@@ -1,8 +1,8 @@
+GOTESTSUM_ELAPSED=0.000
 GOTESTSUM_FORMAT=short
 GOTESTSUM_JSONFILE=events.json
 GOTESTSUM_JSONFILE_TIMING_EVENTS=timing.json
 GOTESTSUM_JUNITFILE=junit.xml
-TESTS_ELAPSED=0.000
 TESTS_ERRORS=0
 TESTS_FAILED=13
 TESTS_SKIPPED=5