diff --git a/Dockerfile b/Dockerfile
index 7299c8d..d17a7f8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,4 +10,4 @@ WORKDIR /etc/dotfiles
 COPY . .
 
 # Load the default system shell.
-RUN nix-shell /etc/dotfiles
+RUN nix-shell /etc/dotfiles/shell.nix
diff --git a/README.org b/README.org
index e77c6cf..325f906 100644
--- a/README.org
+++ b/README.org
@@ -83,7 +83,7 @@ WORKDIR /etc/dotfiles
 COPY . .
 
 # Load the default system shell.
-RUN nix-shell /etc/dotfiles
+RUN nix-shell /etc/dotfiles/shell.nix
 #+END_SRC
 
 * Operating System