diff --git a/src/match_list.rs b/src/match_list.rs
index 98d73b9..4e51e02 100644
--- a/src/match_list.rs
+++ b/src/match_list.rs
@@ -169,7 +169,7 @@ impl MatchEntry {
     }
 
     /// Directly access the match flags.
-    pub fn match_flags(&mut self) -> MatchFlag {
+    pub fn match_flags(&self) -> MatchFlag {
         self.flags
     }