diff --git a/src/libcore/macros.rs b/src/libcore/macros.rs
index dfe95d3a4d6b..543e61db67de 100644
--- a/src/libcore/macros.rs
+++ b/src/libcore/macros.rs
@@ -164,7 +164,7 @@ macro_rules! assert_ne {
         match (&$left, &$right) {
             (left_val, right_val) => {
                 if *left_val == *right_val {
-		    panic!(r#"assertion failed: `(left != right)`
+                    panic!(r#"assertion failed: `(left != right)`
   left: `{:?}`
  right: `{:?}`"#, left_val, right_val)
                 }
@@ -175,7 +175,7 @@ macro_rules! assert_ne {
         match (&($left), &($right)) {
             (left_val, right_val) => {
                 if *left_val == *right_val {
-                                        panic!(r#"assertion failed: `(left != right)`
+                    panic!(r#"assertion failed: `(left != right)`
   left: `{:?}`
  right: `{:?}`: {}"#, left_val, right_val,
                            format_args!($($arg)+))