diff --git a/ui/build/config.go b/ui/build/config.go
index bf4aec9..81ea69e 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -67,28 +67,29 @@
 	logsPrefix    string
 
 	// From the arguments
-	parallel          int
-	keepGoing         int
-	verbose           bool
-	checkbuild        bool
-	dist              bool
-	jsonModuleGraph   bool
-	apiBp2build       bool // Generate BUILD files for Soong modules that contribute APIs
-	bp2build          bool
-	queryview         bool
-	reportMkMetrics   bool // Collect and report mk2bp migration progress metrics.
-	soongDocs         bool
-	multitreeBuild    bool // This is a multitree build.
-	skipConfig        bool
-	skipKati          bool
-	skipKatiNinja     bool
-	skipSoong         bool
-	skipNinja         bool
-	skipSoongTests    bool
-	searchApiDir      bool // Scan the Android.bp files generated in out/api_surfaces
-	skipMetricsUpload bool
-	buildStartedTime  int64 // For metrics-upload-only - manually specify a build-started time
-	buildFromTextStub bool
+	parallel                 int
+	keepGoing                int
+	verbose                  bool
+	checkbuild               bool
+	dist                     bool
+	jsonModuleGraph          bool
+	apiBp2build              bool // Generate BUILD files for Soong modules that contribute APIs
+	bp2build                 bool
+	queryview                bool
+	reportMkMetrics          bool // Collect and report mk2bp migration progress metrics.
+	soongDocs                bool
+	multitreeBuild           bool // This is a multitree build.
+	skipConfig               bool
+	skipKati                 bool
+	skipKatiNinja            bool
+	skipSoong                bool
+	skipNinja                bool
+	skipSoongTests           bool
+	searchApiDir             bool // Scan the Android.bp files generated in out/api_surfaces
+	skipMetricsUpload        bool
+	buildStartedTime         int64 // For metrics-upload-only - manually specify a build-started time
+	buildFromTextStub        bool
+	ensureAllowlistIntegrity bool // For CI builds - make sure modules are mixed-built
 
 	// From the product config
 	katiArgs        []string
@@ -883,6 +884,8 @@
 			} else {
 				ctx.Fatalf("Error parsing build-time-started-unix-millis", err)
 			}
+		} else if arg == "--ensure-allowlist-integrity" {
+			c.ensureAllowlistIntegrity = true
 		} else if len(arg) > 0 && arg[0] == '-' {
 			parseArgNum := func(def int) int {
 				if len(arg) > 2 {
@@ -1710,6 +1713,10 @@
 	return c.skipMetricsUpload
 }
 
+func (c *configImpl) EnsureAllowlistIntegrity() bool {
+	return c.ensureAllowlistIntegrity
+}
+
 // Returns a Time object if one was passed via a command-line flag.
 // Otherwise returns the passed default.
 func (c *configImpl) BuildStartedTimeOrDefault(defaultTime time.Time) time.Time {