diff --git a/dev-tools/xtask/src/check_workspace_deps.rs b/dev-tools/xtask/src/check_workspace_deps.rs
index 6e84380c69..76e405ce1a 100644
--- a/dev-tools/xtask/src/check_workspace_deps.rs
+++ b/dev-tools/xtask/src/check_workspace_deps.rs
@@ -31,14 +31,24 @@ pub fn run_cmd() -> Result<()> {
 
     // Iterate the workspace packages and fill out the maps above.
     for pkg_info in workspace.workspace_packages() {
+        let manifest_path = &pkg_info.manifest_path;
+        let manifest = read_cargo_toml(manifest_path)?;
+
+        // Check that `[lints] workspace = true` is set.
+        if !manifest.lints.map(|lints| lints.workspace).unwrap_or(false) {
+            eprintln!(
+                "error: package {:?} does not have `[lints] workspace = true` set",
+                pkg_info.name
+            );
+            nerrors += 1;
+        }
+
         if pkg_info.name == WORKSPACE_HACK_PACKAGE_NAME {
             // Skip over workspace-hack because hakari doesn't yet support
             // workspace deps: https://github.com/guppy-rs/guppy/issues/7
             continue;
         }
 
-        let manifest_path = &pkg_info.manifest_path;
-        let manifest = read_cargo_toml(manifest_path)?;
         for tree in [
             &manifest.dependencies,
             &manifest.dev_dependencies,
diff --git a/workspace-hack/Cargo.toml b/workspace-hack/Cargo.toml
index 4222d6141a..d15a2242be 100644
--- a/workspace-hack/Cargo.toml
+++ b/workspace-hack/Cargo.toml
@@ -9,6 +9,9 @@ description = "workspace-hack package, managed by hakari"
 # You can choose to publish this crate: see https://docs.rs/cargo-hakari/latest/cargo_hakari/publishing.
 publish = false
 
+[lints]
+workspace = true
+
 # The parts of the file between the BEGIN HAKARI SECTION and END HAKARI SECTION comments
 # are managed by hakari.