diff --git a/src/de.rs b/src/de.rs
index 1932e271..912347c8 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -560,7 +560,7 @@ where
     // if we are left with leading zero(s) followed by numeric characters
     // this is in fact a string according to the YAML 1.2 spec
     // https://yaml.org/spec/1.2/spec.html#id2761292
-    if v.len() > 1 &&  v.starts_with("0") && v.chars().all(char::is_numeric) {
+    if v.len() > 1 &&  v.starts_with('0') && v.chars().all(char::is_numeric) {
         return visitor.visit_str(v);
     }
     if let Ok(n) = v.parse() {