diff --git a/java/droiddoc.go b/java/droiddoc.go
index 5d01b54..c898498 100644
--- a/java/droiddoc.go
+++ b/java/droiddoc.go
@@ -1325,13 +1325,8 @@
 		validatingNullability :=
 			strings.Contains(d.Javadoc.args, "--validate-nullability-from-merged-stubs") ||
 				String(d.properties.Validate_nullability_from_list) != ""
+
 		migratingNullability := String(d.properties.Previous_api) != ""
-
-		if !(migratingNullability || validatingNullability) {
-			ctx.PropertyErrorf("previous_api",
-				"has to be non-empty if annotations was enabled (unless validating nullability)")
-		}
-
 		if migratingNullability {
 			previousApi := android.PathForModuleSrc(ctx, String(d.properties.Previous_api))
 			cmd.FlagWithInput("--migrate-nullness ", previousApi)