diff --git a/src/librustc/mir/mod.rs b/src/librustc/mir/mod.rs
index 624f8ed789cd..3bbec3915dd5 100644
--- a/src/librustc/mir/mod.rs
+++ b/src/librustc/mir/mod.rs
@@ -1133,10 +1133,7 @@ pub fn fmt_head<W: Write>(&self, fmt: &mut W) -> fmt::Result {
                 if !expected {
                     write!(fmt, "!")?;
                 }
-                write!(fmt, "{:?}, ", cond)?;
-                write!(fmt, "\"{:?}\"", msg)?;
-
-                write!(fmt, ")")
+                write!(fmt, "{:?}, \"{:?}\")", cond, msg)
             },
             FalseEdges { .. } => write!(fmt, "falseEdges"),
             FalseUnwind { .. } => write!(fmt, "falseUnwind"),