diff --git a/pkgs/build-support/node/fetch-pnpm-deps/pnpm-config-hook.sh b/pkgs/build-support/node/fetch-pnpm-deps/pnpm-config-hook.sh
index 5cafdd6d1d8b..38f6eb97b56b 100644
--- a/pkgs/build-support/node/fetch-pnpm-deps/pnpm-config-hook.sh
+++ b/pkgs/build-support/node/fetch-pnpm-deps/pnpm-config-hook.sh
@@ -71,12 +71,13 @@ pnpmConfigHook() {
     pnpm config set package-import-method clone-or-copy
 
     echo "Installing dependencies"
-    if [[ -n "$pnpmWorkspaces" ]]; then
-        local IFS=" "
-        for ws in $pnpmWorkspaces; do
-            pnpmInstallFlags+=("--filter=$ws")
-        done
-    fi
+
+    local -a pnpmWorkspacesArray
+    concatTo pnpmWorkspacesArray pnpmWorkspaces
+
+    for ws in "${pnpmWorkspacesArray[@]}"; do
+        pnpmInstallFlags+=("--filter=$ws")
+    done
 
     runHook prePnpmInstall