diff --git a/src/librustsyntax/parse/parser.rs b/src/librustsyntax/parse/parser.rs
index 4131d3eca96..46ccb09b220 100644
--- a/src/librustsyntax/parse/parser.rs
+++ b/src/librustsyntax/parse/parser.rs
@@ -1484,7 +1484,7 @@ fn parse_let(p: parser) -> @ast::decl {
 fn parse_instance_var(p:parser, pr: ast::privacy) -> @ast::class_member {
     let mut is_mutbl = ast::class_immutable;
     let lo = p.span.lo;
-    if eat_word(p, "mut") || eat_word(p, "mutable") {
+    if eat_word(p, "mut") {
         is_mutbl = ast::class_mutable;
     }
     if !is_plain_ident(p.token) {
diff --git a/src/librustsyntax/parse/token.rs b/src/librustsyntax/parse/token.rs
index f60e2f26381..9413607aaf1 100644
--- a/src/librustsyntax/parse/token.rs
+++ b/src/librustsyntax/parse/token.rs
@@ -260,7 +260,7 @@ fn bad_expr_word_table() -> hashmap<str, ()> {
                 "class", "const", "cont", "copy", "crust", "do", "else",
                 "enum", "export", "fail", "fn", "for", "if",  "iface",
                 "impl", "import", "let", "log", "loop", "mod",
-                "mut", "mutable", "native", "new", "pure", "resource",
+                "mut", "native", "new", "pure", "resource",
                 "ret", "trait", "type", "unchecked", "unsafe", "while"];
     for keys.each {|word|
         words.insert(word, ());
diff --git a/src/test/auxiliary/cci_class_4.rs b/src/test/auxiliary/cci_class_4.rs
index 1ed65b21d03..ef16b540d0c 100644
--- a/src/test/auxiliary/cci_class_4.rs
+++ b/src/test/auxiliary/cci_class_4.rs
@@ -12,7 +12,7 @@ class cat {
     }
   }
 
-  let mutable how_hungry : int;
+  let mut how_hungry : int;
   let name : str;
 
   new(in_x : uint, in_y : int, in_name: str)
diff --git a/src/test/compile-fail/ctor-uninit-var.rs b/src/test/compile-fail/ctor-uninit-var.rs
index 5450cd77189..b6f94c11fe5 100644
--- a/src/test/compile-fail/ctor-uninit-var.rs
+++ b/src/test/compile-fail/ctor-uninit-var.rs
@@ -1,7 +1,7 @@
 // error-pattern:unsatisfied precondition
 class cat {
   priv {
-    let mutable meows : uint;
+    let mut meows : uint;
   }
 
   let how_hungry : int;
diff --git a/src/test/compile-fail/mutable-class-fields-2.rs b/src/test/compile-fail/mutable-class-fields-2.rs
index 1c06727ec2e..d00d5dda230 100644
--- a/src/test/compile-fail/mutable-class-fields-2.rs
+++ b/src/test/compile-fail/mutable-class-fields-2.rs
@@ -1,7 +1,7 @@
 // error-pattern:assigning to immutable field
 class cat {
   priv {
-    let mutable meows : uint;
+    let mut meows : uint;
   }
 
   let how_hungry : int;
diff --git a/src/test/compile-fail/mutable-class-fields.rs b/src/test/compile-fail/mutable-class-fields.rs
index adac61c5e64..6ee8c5ead7e 100644
--- a/src/test/compile-fail/mutable-class-fields.rs
+++ b/src/test/compile-fail/mutable-class-fields.rs
@@ -1,7 +1,7 @@
 // error-pattern:assigning to immutable field
 class cat {
   priv {
-    let mutable meows : uint;
+    let mut meows : uint;
   }
 
   let how_hungry : int;
diff --git a/src/test/run-pass/class-implement-iface-cross-crate.rs b/src/test/run-pass/class-implement-iface-cross-crate.rs
index 2c845fa1c03..7a0cfef5398 100644
--- a/src/test/run-pass/class-implement-iface-cross-crate.rs
+++ b/src/test/run-pass/class-implement-iface-cross-crate.rs
@@ -15,7 +15,7 @@ class cat implements noisy {
     }
   }
 
-  let mutable how_hungry : int;
+  let mut how_hungry : int;
   let name : str;
 
   new(in_x : uint, in_y : int, in_name: str)
diff --git a/src/test/run-pass/class-implement-ifaces.rs b/src/test/run-pass/class-implement-ifaces.rs
index 6e09d045820..01fde15d02d 100644
--- a/src/test/run-pass/class-implement-ifaces.rs
+++ b/src/test/run-pass/class-implement-ifaces.rs
@@ -14,7 +14,7 @@ class cat implements noisy {
     }
   }
 
-  let mutable how_hungry : int;
+  let mut how_hungry : int;
   let name : str;
 
   new(in_x : uint, in_y : int, in_name: str)
diff --git a/src/test/run-pass/classes.rs b/src/test/run-pass/classes.rs
index f2790cee354..59a8efcaad7 100644
--- a/src/test/run-pass/classes.rs
+++ b/src/test/run-pass/classes.rs
@@ -10,7 +10,7 @@ class cat {
     }
   }
 
-  let mutable how_hungry : int;
+  let mut how_hungry : int;
   let name : str;
 
   new(in_x : uint, in_y : int, in_name: str)