diff --git a/polkadot-parachains/rococo/src/lib.rs b/polkadot-parachains/rococo/src/lib.rs
index e41111c608..cf6dd18bb1 100644
--- a/polkadot-parachains/rococo/src/lib.rs
+++ b/polkadot-parachains/rococo/src/lib.rs
@@ -352,8 +352,8 @@ pub type XcmOriginToTransactDispatchOrigin = (
 );
 
 parameter_types! {
-	// One XCM operation is 1_000_000 weight - almost certainly a conservative estimate.
-	pub UnitWeightCost: Weight = 1_000_000;
+	// One XCM operation is 1_000_000_000 weight - almost certainly a conservative estimate.
+	pub UnitWeightCost: Weight = 1_000_000_000;
 	// One ROC buys 1 second of weight.
 	pub const WeightPrice: (MultiLocation, u128) = (MultiLocation::parent(), ROC);
 	pub const MaxInstructions: u32 = 100;
diff --git a/polkadot-parachains/shell/src/lib.rs b/polkadot-parachains/shell/src/lib.rs
index 84823d52b5..6c6ed647cd 100644
--- a/polkadot-parachains/shell/src/lib.rs
+++ b/polkadot-parachains/shell/src/lib.rs
@@ -194,8 +194,8 @@ match_type! {
 }
 
 parameter_types! {
-	// One XCM operation is 1_000_000 weight - almost certainly a conservative estimate.
-	pub UnitWeightCost: Weight = 1_000_000;
+	// One XCM operation is 1_000_000_000 weight - almost certainly a conservative estimate.
+	pub UnitWeightCost: Weight = 1_000_000_000;
 	pub const MaxInstructions: u32 = 100;
 }
 
diff --git a/polkadot-parachains/statemint/src/lib.rs b/polkadot-parachains/statemint/src/lib.rs
index b574184eba..d06be642ac 100644
--- a/polkadot-parachains/statemint/src/lib.rs
+++ b/polkadot-parachains/statemint/src/lib.rs
@@ -522,8 +522,8 @@ pub type XcmOriginToTransactDispatchOrigin = (
 );
 
 parameter_types! {
-	// One XCM operation is 1_000_000 weight - almost certainly a conservative estimate.
-	pub UnitWeightCost: Weight = 1_000_000;
+	// One XCM operation is 1_000_000_000 weight - almost certainly a conservative estimate.
+	pub UnitWeightCost: Weight = 1_000_000_000;
 	pub const MaxInstructions: u32 = 100;
 }
 
diff --git a/polkadot-parachains/westmint/src/lib.rs b/polkadot-parachains/westmint/src/lib.rs
index 2454e40718..801e8005bb 100644
--- a/polkadot-parachains/westmint/src/lib.rs
+++ b/polkadot-parachains/westmint/src/lib.rs
@@ -510,7 +510,8 @@ pub type XcmOriginToTransactDispatchOrigin = (
 );
 
 parameter_types! {
-	pub UnitWeightCost: Weight = 1_000;
+	// One XCM operation is 1_000_000_000 weight - almost certainly a conservative estimate.
+	pub UnitWeightCost: Weight = 1_000_000_000;
 	pub const MaxInstructions: u32 = 100;
 }