diff --git a/Cargo.toml b/Cargo.toml
index ee94e2a30..c1841af9b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 default = ["cli", "fs", "layout-cache"]
 cli = ["anyhow", "codespan-reporting", "fs", "pico-args", "same-file"]
 fs = ["dirs", "memmap2", "same-file", "walkdir"]
-layout-cache = []
+layout-cache = ["rand"]
 
 [profile.dev]
 # Faster compilation
@@ -25,7 +25,6 @@ image = { version = "0.23", default-features = false, features = ["png", "jpeg"]
 itertools = "0.10"
 miniz_oxide = "0.4"
 pdf-writer = { git = "https://github.com/typst/pdf-writer", rev = "a750b66" }
-rand = "0.8"
 rustybuzz = "0.4"
 serde = { version = "1", features = ["derive", "rc"] }
 ttf-parser = "0.12"
@@ -37,6 +36,7 @@ codespan-reporting = { version = "0.11", optional = true }
 dirs = { version = "3", optional = true }
 memmap2 = { version = "0.3", optional = true }
 pico-args = { version = "0.4", optional = true }
+rand = { version = "0.8", optional = true }
 same-file = { version = "1", optional = true }
 walkdir = { version = "2", optional = true }