diff --git a/crates/sol-types/tests/macros/sol/mod.rs b/crates/sol-types/tests/macros/sol/mod.rs
index 2c15bac45..ec68ca1a7 100644
--- a/crates/sol-types/tests/macros/sol/mod.rs
+++ b/crates/sol-types/tests/macros/sol/mod.rs
@@ -1223,3 +1223,22 @@ fn mapping_getters() {
     let _ =
         TestIbc::channelsReturn { _0: 0u8, _1: 0u32, _2: 0u32, _3: bytes![], _4: String::new() };
 }
+
+// https://github.com/alloy-rs/core/issues/829
+#[test]
+fn bytes64() {
+    sol! {
+        struct bytes64 {
+            bytes32 a;
+            bytes32 b;
+        }
+
+        function f(bytes64 x) public returns(bytes64 y) {
+            bytes64 z = x;
+            y = z;
+        }
+    }
+
+    let x = bytes64 { a: B256::ZERO, b: B256::ZERO };
+    assert_eq!(bytes64::abi_encode_packed(&x), alloy_primitives::B512::ZERO.as_slice());
+}
diff --git a/crates/syn-solidity/src/expr/mod.rs b/crates/syn-solidity/src/expr/mod.rs
index 8ca87ffe2..f777a05c6 100644
--- a/crates/syn-solidity/src/expr/mod.rs
+++ b/crates/syn-solidity/src/expr/mod.rs
@@ -222,9 +222,11 @@ impl Expr {
             input.parse().map(Self::Delete)
         } else if lookahead.peek(Ident::peek_any) {
             let ident = input.call(Ident::parse_any)?;
-            match Type::parse_ident(ident.clone()) {
-                Ok(ty) if !ty.is_custom() => ty.parse_payable(input).map(Self::Type),
-                _ => Ok(Self::Ident(ident.into())),
+            let ty = Type::parse_ident(ident.clone()).parse_payable(input);
+            if ty.is_custom() {
+                Ok(Self::Ident(ident.into()))
+            } else {
+                Ok(Self::Type(ty))
             }
         } else {
             Err(lookahead.error())
diff --git a/crates/syn-solidity/src/type/mod.rs b/crates/syn-solidity/src/type/mod.rs
index f8f00656c..94caa1b75 100644
--- a/crates/syn-solidity/src/type/mod.rs
+++ b/crates/syn-solidity/src/type/mod.rs
@@ -228,7 +228,11 @@ impl Type {
     /// keyword separately.
     ///
     /// [ref]: https://docs.soliditylang.org/en/latest/grammar.html#a4.SolidityParser.elementaryTypeName
-    pub fn parse_ident(ident: Ident) -> Result<Self> {
+    pub fn parse_ident(ident: Ident) -> Self {
+        Self::try_parse_ident(ident.clone()).unwrap_or_else(|_| Self::custom(ident))
+    }
+
+    pub fn try_parse_ident(ident: Ident) -> Result<Self> {
         let span = ident.span();
         let s = ident.to_string();
         let ret = match s.as_str() {
@@ -271,11 +275,11 @@ impl Type {
 
     /// Parses the `payable` keyword from the input stream if this type is an
     /// address.
-    pub fn parse_payable(mut self, input: ParseStream<'_>) -> Result<Self> {
+    pub fn parse_payable(mut self, input: ParseStream<'_>) -> Self {
         if let Self::Address(_, opt @ None) = &mut self {
-            *opt = input.parse()?;
+            *opt = input.parse().unwrap();
         }
-        Ok(self)
+        self
     }
 
     /// Returns whether this type is ABI-encoded as a single EVM word (32 bytes).
@@ -478,7 +482,7 @@ impl Type {
             input.parse().map(Self::Custom)
         } else if input.peek(Ident::peek_any) {
             let ident = input.call(Ident::parse_any)?;
-            Self::parse_ident(ident)?.parse_payable(input)
+            Ok(Self::parse_ident(ident).parse_payable(input))
         } else {
             Err(input.error(
                 "expected a Solidity type: \