diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index 0f36fba7a..e5e08210b 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -83,7 +83,6 @@ var Configuration = map[string]PathConfig{
 	"dd":        Allowed,
 	"diff":      Allowed,
 	"egrep":     Allowed,
-	"expr":      Allowed,
 	"find":      Allowed,
 	"fuser":     Allowed,
 	"getconf":   Allowed,
@@ -159,6 +158,7 @@ var Configuration = map[string]PathConfig{
 	"du":       Toybox,
 	"echo":     Toybox,
 	"env":      Toybox,
+	"expr":     Toybox,
 	"head":     Toybox,
 	"id":       Toybox,
 	"mkdir":    Toybox,