diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
index 3fd22793a08a0..480d4a8e48f0e 100644
--- a/src/librustc/session/config.rs
+++ b/src/librustc/session/config.rs
@@ -1286,8 +1286,6 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "print some performance-related statistics"),
     hir_stats: bool = (false, parse_bool, [UNTRACKED],
         "print some statistics about AST and HIR"),
-    mir_stats: bool = (false, parse_bool, [UNTRACKED],
-        "print some statistics about MIR"),
     always_encode_mir: bool = (false, parse_bool, [TRACKED],
         "encode MIR of all functions into the crate metadata"),
     osx_rpath_install_name: bool = (false, parse_bool, [TRACKED],