diff --git a/ocaml/.env b/ocaml/.env
new file mode 100644
index 0000000..51602f0
--- /dev/null
+++ b/ocaml/.env
@@ -0,0 +1,4 @@
+# The default cache path is immutable when odig is installed using Nix
+ODIG_CACHE_DIR="$PWD/_build/default/.odig"
+# Using _build directory may not be properly allowed for storing user contents
+SHERLODOC_DB="$PWD/_build/default/.sherlodoc.marshal"
diff --git a/ocaml/.envrc b/ocaml/.envrc
index 3112cd7..3b11770 100644
--- a/ocaml/.envrc
+++ b/ocaml/.envrc
@@ -1,5 +1,2 @@
 use flake
-
-# Using _build directory may not be properly allowed for storing user contents
-export ODIG_CACHE_DIR="$(pwd)/_build/default/.odig"
-export SHERLODOC_DB="$(pwd)/_build/default/.sherlodoc.marshal"
+dotenv
diff --git a/ocaml/justfile b/ocaml/justfile
index e736a19..02aea0a 100644
--- a/ocaml/justfile
+++ b/ocaml/justfile
@@ -2,7 +2,7 @@ odig-odoc:
     odig odoc
 
 sherlodoc-index: odig-odoc
-    find "$(odig cache path)/odoc" -name '*.odocl' \
+    find "${ODIG_CACHE_DIR}/odoc" -name '*.odocl' \
     | grep -v '__' \
     | xargs sherlodoc index