diff --git a/src/build.rs b/src/build.rs
index 180cce0..accc8de 100644
--- a/src/build.rs
+++ b/src/build.rs
@@ -46,7 +46,7 @@ pub fn create_static_output_files(source_dir: &str) {
     Err(err) => {
       if err.kind() == NotFound {
       } else {
-        Err(err).unwrap()
+        Err(err).unwrap();
       }
     }
   }
diff --git a/src/command_runner.rs b/src/command_runner.rs
index b672a4c..5f37ca1 100644
--- a/src/command_runner.rs
+++ b/src/command_runner.rs
@@ -181,7 +181,7 @@ where
 {
   async fn run(&self, program: &str, args: &[&OsStr], input: &str) -> IoResult<Output> {
     let raw_new_args = [self.user_name, "-s", "/usr/bin/env", "--", program];
-    let mut new_args: Vec<&OsStr> = raw_new_args.iter().map(|s| s.as_ref()).collect();
+    let mut new_args: Vec<&OsStr> = raw_new_args.iter().map(AsRef::as_ref).collect();
     new_args.extend_from_slice(args);
     self.command_runner.run("su", &new_args, input).await
   }
diff --git a/src/symbols/mariadb/dump.rs b/src/symbols/mariadb/dump.rs
index 1b503fa..11accac 100644
--- a/src/symbols/mariadb/dump.rs
+++ b/src/symbols/mariadb/dump.rs
@@ -36,7 +36,7 @@ impl<N: AsRef<str>, C: CommandRunner, S: Storage> Symbol for Dump<'_, N, C, S> {
     let dump_date = self.storage.recent_date()?;
     let output = self.run_sql(&format!("select UNIX_TIMESTAMP(MAX(UPDATE_TIME)) from information_schema.tables WHERE table_schema = '{}'", self.db_name.as_ref())).await?;
     let modified_date = output.trim_end();
-    Ok(modified_date != "NULL" && u64::from_str(modified_date)? <= dump_date)
+    Ok(modified_date == "NULL" || u64::from_str(modified_date)? <= dump_date)
   }
 
   async fn execute(&self) -> Result<(), Box<dyn Error>> {