diff --git a/pre_commit/languages/r.py b/pre_commit/languages/r.py
index c6b07a08c..9fbe49195 100644
--- a/pre_commit/languages/r.py
+++ b/pre_commit/languages/r.py
@@ -91,8 +91,8 @@ def install_environment(
         shutil.copy(prefix.path('renv.lock'), env_dir)
         cmd_output_b(
             'Rscript', '--vanilla', '-e',
-            f"""\
-            prefix_dir <- "{os.path.normpath(prefix.prefix_dir)}"
+            fr"""
+            prefix_dir <- "{prefix.prefix_dir}"
             missing_pkgs <- setdiff(
                 "renv", unname(installed.packages()[, "Package"])
             )