1 files changed, 3 insertions, 3 deletions

diff --git a/src/main/java/cuchaz/enigma/analysis/Token.java b/src/main/java/cuchaz/enigma/analysis/Token.java
index 14fa7ca..12e0aa6 100644
--- a/src/main/java/cuchaz/enigma/analysis/Token.java
+++ b/src/main/java/cuchaz/enigma/analysis/Token.java
@@ -30,12 +30,12 @@ public class Token implements Comparable<Token> {
                 return to.length() - length;
         }
 
-        public String rename(String source, String to) {
+        public void rename(StringBuffer source, String to) {
                 int oldEnd = this.end;
                 this.text = to;
                 this.end = this.start + to.length();
 
-                return source.substring(0, this.start) + to + source.substring(oldEnd);
+                source.replace(start, oldEnd, to);
         }
 
         public Token move(int offset) {
@@ -64,7 +64,7 @@ public class Token implements Comparable<Token> {
         }
 
         public boolean equals(Token other) {
-                return start == other.start && end == other.end;
+                return start == other.start && end == other.end && text.equals(other.text);
         }
 
         @Override