diff --git a/android/androidmk.go b/android/androidmk.go
index 9853d2c..967c550 100644
--- a/android/androidmk.go
+++ b/android/androidmk.go
@@ -845,7 +845,7 @@
 		case "*selinux.selinuxContextsModule": // license properties written
 		case "*sysprop.syspropLibrary": // license properties written
 		default:
-			if ctx.Config().IsEnvTrue("ANDROID_REQUIRE_LICENSES") {
+			if !ctx.Config().IsEnvFalse("ANDROID_REQUIRE_LICENSES") {
 				return fmt.Errorf("custom make rules not allowed for %q (%q) module %q", ctx.ModuleType(mod), reflect.TypeOf(mod), ctx.ModuleName(mod))
 			}
 		}