diff --git a/README.md b/README.md
index 997e0f16124749c40927cabccdfbf0e5518631cf..29a282da7d61352508b3ba55153c4bc8abe98f2a 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ git clone https://gitlab.redox-os.org/redox-os/ion/
 cd ion
 make
 sudo make install prefix=/usr
-sudo make update-shells
+sudo make update-shells prefix=/usr
 ```
 
 > To compile in DEBUG mode, pass `DEBUG=1` as an argument to `make`