diff --git a/Build-instructions-(Ubuntu).md b/Build-instructions-(Ubuntu).md
index 2953b21..78e6aeb 100644
--- a/Build-instructions-(Ubuntu).md
+++ b/Build-instructions-(Ubuntu).md
@@ -70,7 +70,7 @@ Now it's time to build Proton itself:
 
 If you encounter the error `mutex in namespace std does not name a type`, you will need to do the following (as noted on [Stack Overflow](https://stackoverflow.com/questions/14191566/c-mutex-in-namespace-std-does-not-name-a-type)):
 
-    $ cd $(which i686-w64-mingw32-g++)
+    $ cd $(dirname $(which i686-w64-mingw32-g++))
     $ sudo ln -s ./i686-w64-mingw32-g++-posix i686-w64-mingw32-g++
 
 To package Proton after successful build: