diff --git a/scripts/firedrake-install b/scripts/firedrake-install
index 7ca37f44c8..b93d7ebd1e 100755
--- a/scripts/firedrake-install
+++ b/scripts/firedrake-install
@@ -1650,7 +1650,7 @@ else:
         name = split_requirements_url(p)[0]
         deps.update(list_cloned_dependencies(name))
         deps[name] = p
-    packages = list(deps.keys())
+    packages = ["petsc4py"] + list(deps.keys())
     packages += ["firedrake"]
 
     # update packages.