diff --git a/Cargo.lock b/Cargo.lock
index 1440af286..6d6d74e4b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1254,6 +1254,7 @@ dependencies = [
  "egui-wgpu",
  "fj-interop",
  "fj-math",
+ "getrandom",
  "raw-window-handle 0.4.3",
  "rfd",
  "thiserror",
diff --git a/crates/fj-viewer/Cargo.toml b/crates/fj-viewer/Cargo.toml
index 4aded387e..28747908f 100644
--- a/crates/fj-viewer/Cargo.toml
+++ b/crates/fj-viewer/Cargo.toml
@@ -31,3 +31,9 @@ features = ["xdg-portal"]
 [dependencies.wgpu]
 version = "0.13.1"
 features = ["webgl"]
+
+# We don't depend on `getrandom` directly, but we need this to enable the `js`
+# feature when cross-compiling to WASM. Otherwise, `getrandom` will not build.
+[target.'cfg(target_arch = "wasm32")'.dependencies.getrandom]
+version = "0.2.8"
+features = ["js"]