diff --git a/src/ch01-02-hello-world.md b/src/ch01-02-hello-world.md
index 8d8d754d7b..f291463799 100644
--- a/src/ch01-02-hello-world.md
+++ b/src/ch01-02-hello-world.md
@@ -198,4 +198,4 @@ code. Next, we’ll introduce you to the Cargo tool, which will help you write
 real-world Rust programs.
 
 [troubleshooting]: ch01-01-installation.html#troubleshooting
-[devtools]: appendix-04-useful-development-tools.md
+[devtools]: appendix-04-useful-development-tools.html