diff --git a/Cargo.toml b/Cargo.toml
index 0767966af2..6cc9af4927 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,4 +30,4 @@ std = [
     "frame-system/std",
     "pallet-evm/std",
     "evm/std",
-]
\ No newline at end of file
+]
diff --git a/src/lib.rs b/src/lib.rs
index f76c2f6878..a82108db39 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -120,6 +120,16 @@ impl OutputBuilder {
 		self.data.extend_from_slice(&buffer);
 		self
 	}
+
+	/// Push a U256 to the output.
+	pub fn write_bool<T: Into<bool>>(mut self, value: T) -> Self {
+		let mut buffer = [0u8; 32];
+		if value.into() {
+			buffer[31] = 1;
+		}
+		self.data.extend_from_slice(&buffer);
+		self
+	}
 }
 
 impl Default for OutputBuilder {