diff --git a/crates/primitives/src/signature/parity.rs b/crates/primitives/src/signature/parity.rs
index 20d9a08d98..804118589c 100644
--- a/crates/primitives/src/signature/parity.rs
+++ b/crates/primitives/src/signature/parity.rs
@@ -106,7 +106,8 @@ impl Parity {
         match *self {
             Self::Parity(b) => Self::Parity(!b),
             Self::NonEip155(b) => Self::NonEip155(!b),
-            Self::Eip155(v @ 0..=34) => Self::Eip155(if v % 2 == 0 { v - 1 } else { v + 1 }),
+            Self::Eip155(0) => Self::Eip155(1),
+            Self::Eip155(v @ 1..=34) => Self::Eip155(if v % 2 == 0 { v - 1 } else { v + 1 }),
             Self::Eip155(v @ 35..) => Self::Eip155(v ^ 1),
         }
     }
@@ -239,4 +240,22 @@ mod test {
 
         assert_eq!(p.with_chain_id(1), Parity::Eip155(37));
     }
+
+    #[test]
+    fn invert_parity() {
+        let p = Parity::Eip155(0);
+        assert_eq!(p.inverted(), Parity::Eip155(1));
+
+        let p = Parity::Eip155(22);
+        assert_eq!(p.inverted(), Parity::Eip155(21));
+
+        let p = Parity::Eip155(58);
+        assert_eq!(p.inverted(), Parity::Eip155(59));
+
+        let p = Parity::NonEip155(false);
+        assert_eq!(p.inverted(), Parity::NonEip155(true));
+
+        let p = Parity::Parity(true);
+        assert_eq!(p.inverted(), Parity::Parity(false));
+    }
 }