diff --git a/main.go b/main.go
index 48eee52..8efd34a 100644
--- a/main.go
+++ b/main.go
@@ -36,6 +36,7 @@ import (
 
 	"golang.org/x/exp/slices"
 	"golang.org/x/mod/modfile"
+	"golang.org/x/mod/module"
 	"golang.org/x/mod/semver"
 	"golang.org/x/tools/go/ast/astutil"
 
@@ -337,12 +338,6 @@ func mainErr(args []string) error {
 		}
 
 		// For the tests.
-		if v := os.Getenv("GARBLE_TEST_VERSION"); v != "" {
-			mod.Version = v
-		}
-		if v := os.Getenv("GARBLE_TEST_SUM"); v != "" {
-			mod.Sum = v
-		}
 		if v := os.Getenv("GARBLE_TEST_SETTINGS"); v != "" {
 			var extra []debug.BuildSetting
 			if err := json.Unmarshal([]byte(v), &extra); err != nil {
@@ -351,7 +346,30 @@ func mainErr(args []string) error {
 			info.Settings = append(info.Settings, extra...)
 		}
 
-		fmt.Printf("%s %s %s\n\n", mod.Path, mod.Version, mod.Sum)
+		// Until https://github.com/golang/go/issues/50603 is implemented,
+		// manually construct something like a pseudo-version.
+		// TODO: remove when this code is dead, hopefully in Go 1.20.
+		if mod.Version == "(devel)" {
+			var vcsTime time.Time
+			var vcsRevision string
+			for _, setting := range info.Settings {
+				switch setting.Key {
+				case "vcs.time":
+					// If the format is invalid, we'll print a zero timestamp.
+					vcsTime, _ = time.Parse(time.RFC3339Nano, setting.Value)
+				case "vcs.revision":
+					vcsRevision = setting.Value
+					if len(vcsRevision) > 12 {
+						vcsRevision = vcsRevision[:12]
+					}
+				}
+			}
+			if vcsRevision != "" {
+				mod.Version = module.PseudoVersion("", "", vcsTime, vcsRevision)
+			}
+		}
+
+		fmt.Printf("%s %s\n\n", mod.Path, mod.Version)
 		fmt.Printf("Build settings:\n")
 		for _, setting := range info.Settings {
 			if setting.Value == "" {
diff --git a/testdata/scripts/help.txt b/testdata/scripts/help.txt
index bd819ab..783c05e 100644
--- a/testdata/scripts/help.txt
+++ b/testdata/scripts/help.txt
@@ -91,18 +91,16 @@ stdout -count=1 'Build settings'
 stdout -count=3 '-compiler|GOOS|GOARCH'
 [go1.19] ! stdout 'vcs'
 
-env GARBLE_TEST_VERSION='v0.88.99'
-env GARBLE_TEST_SUM='h1:someBase64epYSXwA'
 # Obtained from a real build while developing.
 env GARBLE_TEST_SETTINGS='[{"Key":"vcs","Value":"git"},{"Key":"vcs.revision","Value":"91ea246349544769f5100c29f79cb0f173abfeea"},{"Key":"vcs.time","Value":"2022-03-18T13:45:11Z"},{"Key":"vcs.modified","Value":"true"}]'
 garble version
-stdout -count=1 'mvdan.cc/garble v0\.88\.99 h1:someBase64epYSXwA'
+stdout -count=1 'mvdan\.cc/garble v0\.0\.0-20220318134511-91ea24634954'
 stdout -count=1 'Build settings'
 stdout -count=3 '-compiler|GOOS|GOARCH'
 [go1.19] stdout -count=1 'vcs git'
-[go1.19] stdout -count=1 'vcs.revision 91ea246349544769f5100c29f79cb0f173abfeea'
-[go1.19] stdout -count=1 'vcs.time 2022-03-18T13:45:11Z'
-[go1.19] stdout -count=1 'vcs.modified true'
+[go1.19] stdout -count=1 'vcs\.revision 91ea246349544769f5100c29f79cb0f173abfeea'
+[go1.19] stdout -count=1 'vcs\.time 2022-03-18T13:45:11Z'
+[go1.19] stdout -count=1 'vcs\.modified true'
 
 ! garble version -flag
 stderr 'usage: garble version'