diff --git a/README.md b/README.md
index 4b180edc9..9cd43294e 100644
--- a/README.md
+++ b/README.md
@@ -132,7 +132,7 @@ developing the UI. To make UI development more convenient, the binary supports a
 _passthrough directory_. This is an arbitrary local directory from which UI
 assets are served. Note this option is only available in dev mode. For example:
 
-  ```BOUNDARY_DEV_PASSTHROUGH_DIRECTORY=/boundary-ui/ui/admin/dist ~/go/bin/boundary dev```
+  ```BOUNDARY_DEV_UI_PASSTHROUGH_DIR=/boundary-ui/ui/admin/dist ~/go/bin/boundary dev```
 
 ### Download and Run from Release Page
 
diff --git a/internal/cmd/commands/dev/dev.go b/internal/cmd/commands/dev/dev.go
index 71e0f8e4b..f8816e6b1 100644
--- a/internal/cmd/commands/dev/dev.go
+++ b/internal/cmd/commands/dev/dev.go
@@ -67,7 +67,7 @@ type Command struct {
 	flagWorkerAuthKey                   string
 	flagWorkerProxyListenAddr           string
 	flagWorkerPublicAddr                string
-	flagPassthroughDirectory            string
+	flagUiPassthroughDir                string
 	flagRecoveryKey                     string
 	flagDatabaseUrl                     string
 	flagContainerImage                  string
@@ -253,9 +253,9 @@ func (c *Command) Flags() *base.FlagSets {
 	})
 
 	f.StringVar(&base.StringVar{
-		Name:   "passthrough-directory",
-		Target: &c.flagPassthroughDirectory,
-		EnvVar: "BOUNDARY_DEV_PASSTHROUGH_DIRECTORY",
+		Name:   "ui-passthrough-dir",
+		Target: &c.flagUiPassthroughDir,
+		EnvVar: "BOUNDARY_DEV_UI_PASSTHROUGH_DIR",
 		Usage:  "Enables a passthrough directory in the webserver at /",
 	})
 
@@ -420,7 +420,7 @@ func (c *Command) Run(args []string) int {
 	c.DevTargetSessionConnectionLimit = c.flagTargetSessionConnectionLimit
 	c.DevHostAddress = host
 
-	c.Config.PassthroughDirectory = c.flagPassthroughDirectory
+	c.Config.DevUiPassthroughDir = c.flagUiPassthroughDir
 
 	for _, l := range c.Config.Listeners {
 		if len(l.Purpose) != 1 {
diff --git a/internal/cmd/config/config.go b/internal/cmd/config/config.go
index bfc144525..bd47130d7 100644
--- a/internal/cmd/config/config.go
+++ b/internal/cmd/config/config.go
@@ -97,11 +97,11 @@ type Config struct {
 	Controller *Controller `hcl:"controller"`
 
 	// Dev-related options
-	DevController        bool   `hcl:"-"`
-	PassthroughDirectory string `hcl:"-"`
-	DevControllerKey     string `hcl:"-"`
-	DevWorkerAuthKey     string `hcl:"-"`
-	DevRecoveryKey       string `hcl:"-"`
+	DevController       bool   `hcl:"-"`
+	DevUiPassthroughDir string `hcl:"-"`
+	DevControllerKey    string `hcl:"-"`
+	DevWorkerAuthKey    string `hcl:"-"`
+	DevRecoveryKey      string `hcl:"-"`
 
 	// Eventing configuration for the controller
 	Eventing *event.EventerConfig `hcl:"events"`
diff --git a/internal/servers/controller/handler_noui.go b/internal/servers/controller/handler_noui.go
index 20bc64689..1c7ef9e32 100644
--- a/internal/servers/controller/handler_noui.go
+++ b/internal/servers/controller/handler_noui.go
@@ -8,13 +8,13 @@ import (
 	"github.com/hashicorp/boundary/internal/observability/event"
 )
 
-func devPassthroughHandler(passthroughDir string) http.Handler {
+func devUiPassthroughHandler(uiPassthroughDir string) http.Handler {
 	const op = "controller.devPassthroughHandler"
 	ctx := context.TODO()
 	// Panic may not be ideal but this is never a production call and it'll
 	// panic on startup. We could also just change the function to return
 	// an error.
-	abs, err := filepath.Abs(passthroughDir)
+	abs, err := filepath.Abs(uiPassthroughDir)
 	if err != nil {
 		panic(err)
 	}
@@ -26,8 +26,8 @@ func devPassthroughHandler(passthroughDir string) http.Handler {
 }
 
 var handleUi = func(c *Controller) http.Handler {
-	if c.conf.RawConfig.PassthroughDirectory != "" {
-		return devPassthroughHandler(c.conf.RawConfig.PassthroughDirectory)
+	if c.conf.RawConfig.DevUiPassthroughDir != "" {
+		return devUiPassthroughHandler(c.conf.RawConfig.DevUiPassthroughDir)
 	}
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusNotFound)
diff --git a/internal/servers/controller/handler_ui.go b/internal/servers/controller/handler_ui.go
index 9d660c0c1..a174dfd99 100644
--- a/internal/servers/controller/handler_ui.go
+++ b/internal/servers/controller/handler_ui.go
@@ -16,8 +16,8 @@ func init() {
 
 func handleUiWithAssets(c *Controller) http.Handler {
 	var nextHandler http.Handler
-	if c.conf.RawConfig.PassthroughDirectory != "" {
-		nextHandler = devPassthroughHandler(c.conf.RawConfig.PassthroughDirectory)
+	if c.conf.RawConfig.DevUiPassthroughDir != "" {
+		nextHandler = devUiPassthroughHandler(c.conf.RawConfig.DevUiPassthroughDir)
 	} else {
 		nextHandler = ui.Handler()
 	}
diff --git a/internal/servers/controller/handler_ui_test.go b/internal/servers/controller/handler_ui_test.go
index f87154b17..7dace8468 100644
--- a/internal/servers/controller/handler_ui_test.go
+++ b/internal/servers/controller/handler_ui_test.go
@@ -41,7 +41,7 @@ func TestUiRouting(t *testing.T) {
 
 	c := NewTestController(t, &TestControllerOpts{DisableAutoStart: true})
 
-	c.c.conf.RawConfig.PassthroughDirectory = tempDir
+	c.c.conf.RawConfig.DevUiPassthroughDir = tempDir
 	require.NoError(t, c.c.Start())
 	defer c.Shutdown()
 
diff --git a/website/content/docs/developing/ui.mdx b/website/content/docs/developing/ui.mdx
index 2bc8a4b88..51a623200 100644
--- a/website/content/docs/developing/ui.mdx
+++ b/website/content/docs/developing/ui.mdx
@@ -17,5 +17,5 @@ directory a passthrough directory, and you can enable it using an env var while
 conjunction with running Boundary in dev mode:
 
 ```bash
-BOUNDARY_DEV_PASSTHROUGH_DIRECTORY=../boundary-ui/ui/admin/dist boundary dev
+BOUNDARY_DEV_UI_PASSTHROUGH_DIR=../boundary-ui/ui/admin/dist boundary dev
 ```