diff --git a/csv/src/main.rs b/csv/src/main.rs
index 67b8c76..16bdbea 100644
--- a/csv/src/main.rs
+++ b/csv/src/main.rs
@@ -16,7 +16,7 @@ china,usa,england"#.as_bytes().to_vec()
 
 // https://crates.io/crates/csv
 fn main() {
-    let csv_u8_slice = &get_csv_u8_slice()[..];
+    let csv_u8_slice: &[u8] = &get_csv_u8_slice()[..];
     let mut rdr = csv::Reader::from_reader(csv_u8_slice);
     for result in rdr.records() {
         if let Ok(r) = result {