diff --git a/src/model.rs b/src/model.rs
index 366d141..985b6cf 100644
--- a/src/model.rs
+++ b/src/model.rs
@@ -305,7 +305,10 @@ impl BrCode {
         encode.push_str(&format!("5303{:02}", self.currency));
         match self.amount {
             None => (),
-            Some(a) => encode.push_str(&format!("54{:02}{}", a.to_string().len(), a)),
+            Some(a) => {
+                let a = format!("{:.2}", a);
+                encode.push_str(&format!("54{:02}{}", a.len(), a))
+            }
         }
         match self.convenience.clone() {
             None => (),
@@ -449,6 +452,22 @@ mod test {
         assert_eq!(json, expected);
     }
 
+    #[test]
+    fn amount_with_one_decimal_uses_the_brcode_crc() {
+        let mut code = brcode_value();
+        code.amount = Some(10.5);
+        let brcode = code.clone().encode();
+        let crc = &brcode[brcode.len() - 4..];
+        let json = code.to_crc16_json();
+
+        assert!(brcode.contains("540510.50"), "{}", brcode);
+        assert!(
+            json.contains(&format!("\"crc1610\":\"{}\"", crc)),
+            "{}",
+            json
+        );
+    }
+
     fn expected() -> BrCode {
         BrCode {
             payload_version: 1,