diff --git a/document.go b/document.go
index 0f9012f..548dd8e 100644
--- a/document.go
+++ b/document.go
@@ -40,7 +40,7 @@ type Field interface {
 
 	EncodedFieldType() byte
 
-	Analyze()
+	Analyze() error
 
 	Options() FieldIndexingOptions