diff --git a/Formula/msg-cli.rb b/Formula/msg-cli.rb
index 3b6ce22..58607ab 100644
--- a/Formula/msg-cli.rb
+++ b/Formula/msg-cli.rb
@@ -44,6 +44,12 @@ class MsgCli < Formula
   end
 
   def post_install
+    ENV["GUILE_AUTO_COMPILE"] = "0"
+
+    # We need this so we can find other modules.
+    ENV["GUILE_LOAD_PATH"] = HOMEBREW_PREFIX/"share/guile/site/3.0"
+    ENV["GUILE_LOAD_COMPILED_PATH"] = HOMEBREW_PREFIX/"lib/guile/3.0/site-ccache"
+    ENV["GUILE_SYSTEM_EXTENSIONS_PATH"] = HOMEBREW_PREFIX/"lib/guile/3.0/extensions"
     system "guild", "compile", "-o", "#{prefix}/lib/guile/3.0/site-ccache/msg/machine.go", "#{prefix}/share/guile/site/3.0/msg/machine.scm"
   end