diff --git a/primitives/core/src/uint.rs b/primitives/core/src/uint.rs
index f4eb3a19ac36c..4bf914bde2ee1 100644
--- a/primitives/core/src/uint.rs
+++ b/primitives/core/src/uint.rs
@@ -35,7 +35,6 @@ mod tests {
 					($name::from(2), "0x2"),
 					($name::from(10), "0xa"),
 					($name::from(15), "0xf"),
-					($name::from(15), "0xf"),
 					($name::from(16), "0x10"),
 					($name::from(1_000), "0x3e8"),
 					($name::from(100_000), "0x186a0"),
@@ -52,8 +51,6 @@ mod tests {
 				assert!(ser::from_str::<$name>("\"0x\"").unwrap_err().is_data());
 				assert!(ser::from_str::<$name>("\"0xg\"").unwrap_err().is_data());
 				assert!(ser::from_str::<$name>("\"\"").unwrap_err().is_data());
-				assert!(ser::from_str::<$name>("\"10\"").unwrap_err().is_data());
-				assert!(ser::from_str::<$name>("\"0\"").unwrap_err().is_data());
 			}
 		};
 	}