diff --git a/llvm/docs/HowToSubmitABug.rst b/llvm/docs/HowToSubmitABug.rst
index 7881a6e8dcc..d276ee8681f 100644
--- a/llvm/docs/HowToSubmitABug.rst
+++ b/llvm/docs/HowToSubmitABug.rst
@@ -84,8 +84,8 @@ Compile-time optimization bugs
 ------------------------------
 
 If you find that a bug crashes in the optimizer, compile your test-case to a
-``.bc`` file by passing "``-emit-llvm -O0 -c -o foo.bc``".
-Then run:
+``.bc`` file by passing "``-emit-llvm -O1 -Xclang -disable-llvm-passes -c -o
+foo.bc``".  Then run:
 
 .. code-block:: bash