diff --git a/src/rank/mod.rs b/src/rank/mod.rs
index 2c5a4bfc3..3b31c0794 100644
--- a/src/rank/mod.rs
+++ b/src/rank/mod.rs
@@ -18,7 +18,7 @@ pub struct Document {
 }
 
 impl Document {
-    pub fn from_raw(raw: &RawDocument) -> Document {
+    fn from_raw(raw: &RawDocument) -> Document {
         let len = raw.matches.range.len();
         let mut matches = Vec::with_capacity(len);