diff --git a/polkadot-parachains/rococo/src/lib.rs b/polkadot-parachains/rococo/src/lib.rs
index 698fcaad09f..cdfa1d75252 100644
--- a/polkadot-parachains/rococo/src/lib.rs
+++ b/polkadot-parachains/rococo/src/lib.rs
@@ -354,8 +354,8 @@ 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 84823d52b58..6c6ed647cd4 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 b42fb90b3e1..a069882e92e 100644
--- a/polkadot-parachains/statemint/src/lib.rs
+++ b/polkadot-parachains/statemint/src/lib.rs
@@ -524,8 +524,8 @@ 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 a795dad3756..f769bd9bee7 100644
--- a/polkadot-parachains/westmint/src/lib.rs
+++ b/polkadot-parachains/westmint/src/lib.rs
@@ -512,7 +512,8 @@ 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;
 }