diff --git a/ui/build/config.go b/ui/build/config.go
index 1d1f71f..f9f638c 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -57,6 +57,7 @@
 	katiSuffix      string
 	targetDevice    string
 	targetDeviceDir string
+	sandboxConfig   *SandboxConfig
 
 	// Autodetected
 	totalRAM uint64
@@ -120,7 +121,8 @@
 
 func NewConfig(ctx Context, args ...string) Config {
 	ret := &configImpl{
-		environ: OsEnvironment(),
+		environ:       OsEnvironment(),
+		sandboxConfig: &SandboxConfig{},
 	}
 
 	// Default matching ninja