diff --git a/src/error.rs b/src/error.rs
index 334604a9..cbf3ff61 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -185,16 +185,19 @@ impl Error {
     }
 
     /// Returns the byte index the error occurred at.
+    #[must_use]
     pub fn index(&self) -> usize {
         self.index
     }
 
     /// Returns the current character the error occurred at.
+    #[must_use]
     pub fn character(&self) -> Option<char> {
         self.character
     }
 
     /// Returns the type of error that occurred.
+    #[must_use]
     pub fn error(&self) -> &ErrorType {
         &self.error
     }