diff --git a/Formula/g/gastown.rb b/Formula/g/gastown.rb
index 1e68490e37d5..425348e374d0 100644
--- a/Formula/g/gastown.rb
+++ b/Formula/g/gastown.rb
@@ -41,7 +41,7 @@ def install
     system "dolt", "config", "--global", "--add", "user.name", "BrewTestBot"
     system "dolt", "config", "--global", "--add", "user.email", "BrewTestBot@test.com"
 
-    system bin/"gt", "install"
+    system bin/"gt", "install", "--dolt-port", free_port.to_s
     assert_path_exists testpath/"mayor"
   end
 end