diff --git a/substrate/bin/node-template/runtime/src/lib.rs b/substrate/bin/node-template/runtime/src/lib.rs
index 60d8b7485d..8580bfd895 100644
--- a/substrate/bin/node-template/runtime/src/lib.rs
+++ b/substrate/bin/node-template/runtime/src/lib.rs
@@ -251,7 +251,7 @@ construct_runtime!(
 		Aura: aura::{Module, Config<T>, Inherent(Timestamp)},
 		Grandpa: grandpa::{Module, Call, Storage, Config, Event},
 		Indices: indices,
-		Balances: balances::{default, Error},
+		Balances: balances,
 		TransactionPayment: transaction_payment::{Module, Storage},
 		Sudo: sudo,
 		// Used for the module template in `./template.rs`
diff --git a/substrate/bin/node/runtime/src/lib.rs b/substrate/bin/node/runtime/src/lib.rs
index 679bad2371..7a8ba7613b 100644
--- a/substrate/bin/node/runtime/src/lib.rs
+++ b/substrate/bin/node/runtime/src/lib.rs
@@ -527,14 +527,14 @@ construct_runtime!(
 		UncheckedExtrinsic = UncheckedExtrinsic
 	{
 		System: frame_system::{Module, Call, Storage, Config, Event},
-		Utility: pallet_utility::{Module, Call, Storage, Event<T>, Error},
+		Utility: pallet_utility::{Module, Call, Storage, Event<T>},
 		Babe: pallet_babe::{Module, Call, Storage, Config, Inherent(Timestamp)},
 		Timestamp: pallet_timestamp::{Module, Call, Storage, Inherent},
 		Authorship: pallet_authorship::{Module, Call, Storage, Inherent},
 		Indices: pallet_indices,
-		Balances: pallet_balances::{default, Error},
+		Balances: pallet_balances,
 		TransactionPayment: pallet_transaction_payment::{Module, Storage},
-		Staking: pallet_staking::{default, OfflineWorker},
+		Staking: pallet_staking,
 		Session: pallet_session::{Module, Call, Storage, Event, Config<T>},
 		Democracy: pallet_democracy::{Module, Call, Storage, Config, Event<T>},
 		Council: pallet_collective::<Instance1>::{Module, Call, Storage, Origin<T>, Event<T>, Config<T>},
diff --git a/substrate/frame/elections/src/mock.rs b/substrate/frame/elections/src/mock.rs
index c53789f7ad..93efb71355 100644
--- a/substrate/frame/elections/src/mock.rs
+++ b/substrate/frame/elections/src/mock.rs
@@ -154,7 +154,7 @@ frame_support::construct_runtime!(
 		UncheckedExtrinsic = UncheckedExtrinsic
 	{
 		System: system::{Module, Call, Event},
-		Balances: pallet_balances::{Module, Call, Event<T>, Config<T>, Error},
+		Balances: pallet_balances::{Module, Call, Event<T>, Config<T>},
 		Elections: elections::{Module, Call, Event<T>, Config<T>},
 	}
 );
diff --git a/substrate/frame/support/procedural/Cargo.toml b/substrate/frame/support/procedural/Cargo.toml
index 9280289028..321002e08b 100644
--- a/substrate/frame/support/procedural/Cargo.toml
+++ b/substrate/frame/support/procedural/Cargo.toml
@@ -9,7 +9,6 @@ proc-macro = true
 
 [dependencies]
 frame-support-procedural-tools = { version = "2.0.0", path = "./tools" }
-
 proc-macro2 = "1.0.6"
 quote = "1.0.2"
 syn = { version = "1.0.7", features = ["full"] }
diff --git a/substrate/frame/support/procedural/src/construct_runtime/parse.rs b/substrate/frame/support/procedural/src/construct_runtime/parse.rs
index 84ac6573c6..14dd18cb06 100644
--- a/substrate/frame/support/procedural/src/construct_runtime/parse.rs
+++ b/substrate/frame/support/procedural/src/construct_runtime/parse.rs
@@ -180,8 +180,8 @@ impl Parse for ModuleDeclaration {
 			let has_default = parts.into_iter().any(|m| m.is_default());
 			for entry in parts {
 				match entry {
-					ModuleEntry::Part(part) if has_default => {
-						if part.is_included_in_default() {
+					ModuleEntry::Part(part) => {
+						if has_default && part.is_included_in_default() {
 							let msg = format!(
 									"`{}` is already included in `default`. Either remove `default` or remove `{}`",
 									part.name,
@@ -189,8 +189,7 @@ impl Parse for ModuleDeclaration {
 								);
 							return Err(Error::new(part.name.span(), msg));
 						}
-					}
-					ModuleEntry::Part(part) => {
+
 						if !resolved.insert(part.name.clone()) {
 							let msg = format!(
 								"`{}` was already declared before. Please remove the duplicate declaration",
@@ -287,7 +286,18 @@ pub struct ModulePart {
 
 impl Parse for ModulePart {
 	fn parse(input: ParseStream) -> Result<Self> {
-		let name = input.parse()?;
+		let name: Ident = input.parse()?;
+
+		if !ModulePart::all_allowed().iter().any(|n| name == n) {
+			return Err(syn::Error::new(
+				name.span(),
+				format!(
+					"Only the following modules are allowed: {}",
+					ModulePart::format_names(ModulePart::all_allowed()),
+				),
+			))
+		}
+
 		let generics: syn::Generics = input.parse()?;
 		if !generics.params.is_empty() && !Self::is_allowed_generic(&name) {
 			let valid_generics = ModulePart::format_names(ModulePart::allowed_generics());
@@ -313,6 +323,7 @@ impl Parse for ModulePart {
 		} else {
 			None
 		};
+
 		Ok(Self {
 			name,
 			generics,
@@ -330,15 +341,20 @@ impl ModulePart {
 		Self::allowed_args().into_iter().any(|n| ident == n)
 	}
 
-	pub fn allowed_generics() -> Vec<&'static str> {
-		vec!["Event", "Origin", "Config"]
+	pub fn allowed_generics() -> &'static [&'static str] {
+		&["Event", "Origin", "Config"]
 	}
 
-	pub fn allowed_args() -> Vec<&'static str> {
-		vec!["Inherent"]
+	pub fn allowed_args() -> &'static [&'static str] {
+		&["Inherent"]
 	}
 
-	pub fn format_names(names: Vec<&'static str>) -> String {
+	/// Returns all allowed names for module parts.
+	pub fn all_allowed() -> &'static [&'static str] {
+		&["Module", "Call", "Storage", "Event", "Config", "Origin", "Inherent", "ValidateUnsigned"]
+	}
+
+	pub fn format_names(names: &[&'static str]) -> String {
 		let res: Vec<_> = names.into_iter().map(|s| format!("`{}`", s)).collect();
 		res.join(", ")
 	}