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-rw-r--r--src/rustc/driver/rustc.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/rustc/driver/rustc.rs b/src/rustc/driver/rustc.rs
index c60904419d5..0f191c263fc 100644
--- a/src/rustc/driver/rustc.rs
+++ b/src/rustc/driver/rustc.rs
@@ -113,7 +113,7 @@ fn describe_debug_flags() {
     io::println(fmt!("\nAvailable debug options:\n"));
     for session::debugging_opts_map().each |pair| {
         let (name, desc, _) = *pair;
-        io::println(fmt!("    -Z%-20s -- %s", name, desc));
+        io::println(fmt!("    -Z %-20s -- %s", name, desc));
     }
 }