diff --git a/libsqlite3-sys/build.rs b/libsqlite3-sys/build.rs
index e25dc4d..93586ee 100644
--- a/libsqlite3-sys/build.rs
+++ b/libsqlite3-sys/build.rs
@@ -289,7 +289,7 @@ mod build_bundled {
     }
 
     fn env(name: &str) -> Option<OsString> {
-        let prefix = env::var("TARGET").unwrap().to_uppercase().replace("-", "_");
+        let prefix = env::var("TARGET").unwrap().to_uppercase().replace('-', "_");
         let prefixed = format!("{}_{}", prefix, name);
         let var = env::var_os(&prefixed);
 
diff --git a/src/vtab/mod.rs b/src/vtab/mod.rs
index 79bf9d0..ba610fa 100644
--- a/src/vtab/mod.rs
+++ b/src/vtab/mod.rs
@@ -730,7 +730,7 @@ impl InnerConnection {
 pub fn escape_double_quote(identifier: &str) -> Cow<'_, str> {
     if identifier.contains('"') {
         // escape quote by doubling them
-        Owned(identifier.replace("\"", "\"\""))
+        Owned(identifier.replace('"', "\"\""))
     } else {
         Borrowed(identifier)
     }