diff --git a/.github/scripts/check-workspace.py b/.github/scripts/check-workspace.py
index fb3b53acb0..d200122fee 100644
--- a/.github/scripts/check-workspace.py
+++ b/.github/scripts/check-workspace.py
@@ -27,6 +27,7 @@ def main(root, exclude):
 	all_crates = get_crates(root, exclude)
 	print(f'📦 Found {len(all_crates)} crates in total')
 	
+	check_duplicates(workspace_crates)
 	check_missing(workspace_crates, all_crates)
 	check_links(all_crates)
 
@@ -89,6 +90,16 @@ def get_crates(workspace_dir, exclude_crates) -> dict:
 	
 	return crates
 
+# Check that there are no duplicate entries in the workspace.
+def check_duplicates(workspace_crates):
+	print(f'🔎 Checking for duplicate crates')
+	found = {}
+	for path in workspace_crates:
+		if path in found:
+			print(f'❌ crate is listed twice in the workspace {path}')
+			sys.exit(1)
+		found[path] = True
+
 # Check that all crates are in the workspace.
 def check_missing(workspace_crates, all_crates):
 	print(f'🔎 Checking for missing crates')
diff --git a/Cargo.toml b/Cargo.toml
index fd8708a3da..20cc16039f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -175,7 +175,6 @@ members = [
 	"polkadot/node/service",
 	"polkadot/node/subsystem",
 	"polkadot/node/subsystem-bench",
-	"polkadot/node/subsystem-bench",
 	"polkadot/node/subsystem-test-helpers",
 	"polkadot/node/subsystem-types",
 	"polkadot/node/subsystem-util",