1 files changed, 3 insertions, 1 deletions
diff --git a/src/json.rs b/src/json.rs
index 9515661..eeccf5e 100644
--- a/src/json.rs
+++ b/src/json.rs
@@ -4,7 +4,9 @@ use serde_json::Value;
 pub fn number_from_string<'de, D: Deserializer<'de>>(deserializer: D) -> Result<f64, D::Error> {
     Ok(match Value::deserialize(deserializer)? {
         Value::String(s) => s.parse().map_err(de::Error::custom)?,
-        Value::Number(num) => num.as_f64().ok_or(de::Error::custom("Invalid number"))?,
+        Value::Number(num) => num
+            .as_f64()
+            .ok_or_else(|| de::Error::custom("Invalid number"))?,
         _ => return Err(de::Error::custom("wrong type")),
     })
 }