diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index f965f245a..54006d27f 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -83,6 +83,7 @@ var Configuration = map[string]PathConfig{
 	"dd":       Allowed,
 	"diff":     Allowed,
 	"egrep":    Allowed,
+	"expr":     Allowed,
 	"find":     Allowed,
 	"fuser":    Allowed,
 	"getopt":   Allowed,
@@ -135,7 +136,6 @@ var Configuration = map[string]PathConfig{
 	"du":        LinuxOnlyPrebuilt,
 	"echo":      LinuxOnlyPrebuilt,
 	"env":       LinuxOnlyPrebuilt,
-	"expr":      LinuxOnlyPrebuilt,
 	"head":      LinuxOnlyPrebuilt,
 	"getconf":   LinuxOnlyPrebuilt,
 	"hostname":  LinuxOnlyPrebuilt,