diff --git a/src/doc/rustc-dev-guide/src/queries/profiling.md b/src/doc/rustc-dev-guide/src/queries/profiling.md
index ad31c9e5395d..fc8846fc5c5f 100644
--- a/src/doc/rustc-dev-guide/src/queries/profiling.md
+++ b/src/doc/rustc-dev-guide/src/queries/profiling.md
@@ -20,7 +20,7 @@ address [issue 42678](https://github.com/rust-lang/rust/issues/42678).
 Compile the compiler, up to at least stage 1:
 
 ```
-x.py build library/std
+./x.py build library/std
 ```
 
 ### 2. Run `rustc`, with flags