diff --git a/substrate/bin/node-template/node/src/chain_spec.rs b/substrate/bin/node-template/node/src/chain_spec.rs
index 41f582fb64..c5451e81f2 100644
--- a/substrate/bin/node-template/node/src/chain_spec.rs
+++ b/substrate/bin/node-template/node/src/chain_spec.rs
@@ -39,7 +39,7 @@ pub fn authority_keys_from_seed(s: &str) -> (AuraId, GrandpaId) {
 }
 
 pub fn development_config() -> Result<ChainSpec, String> {
-	let wasm_binary = WASM_BINARY.ok_or("Development wasm binary not available".to_string())?;
+	let wasm_binary = WASM_BINARY.ok_or_else(|| "Development wasm not available".to_string())?;
 
 	Ok(ChainSpec::from_genesis(
 		// Name
@@ -78,7 +78,7 @@ pub fn development_config() -> Result<ChainSpec, String> {
 }
 
 pub fn local_testnet_config() -> Result<ChainSpec, String> {
-	let wasm_binary = WASM_BINARY.ok_or("Development wasm binary not available".to_string())?;
+	let wasm_binary = WASM_BINARY.ok_or_else(|| "Development wasm not available".to_string())?;
 
 	Ok(ChainSpec::from_genesis(
 		// Name