diff --git a/blocks/bitcoin/src/inputs.rs b/blocks/bitcoin/src/inputs.rs
index b12bc7f..1110c43 100644
--- a/blocks/bitcoin/src/inputs.rs
+++ b/blocks/bitcoin/src/inputs.rs
@@ -18,7 +18,7 @@ pub fn collect_transaction_inputs(transaction: &Transaction, timestamp: &BlockTi
             index: index as u32,
             spent_block_height: 0, // TODO: Need to look up from previous tx
             spent_tx_id: input.txid.clone(),
-            spent_output_number: input.vout as u64,
+            spent_output_number: input.vout,
             value: 0.0,             // TODO: Need to look up from previous tx
             address: String::new(), // TODO: Need to look up from previous tx
             r#type: String::new(),  // TODO: Need to look up from previous tx
diff --git a/blocks/bitcoin/src/pb/pinax.bitcoin.rs b/blocks/bitcoin/src/pb/pinax.bitcoin.rs
index 89c2a1c..e7ad085 100644
--- a/blocks/bitcoin/src/pb/pinax.bitcoin.rs
+++ b/blocks/bitcoin/src/pb/pinax.bitcoin.rs
@@ -125,8 +125,8 @@ pub struct Input {
     pub spent_block_height: u32,
     #[prost(string, tag="8")]
     pub spent_tx_id: ::prost::alloc::string::String,
-    #[prost(uint64, tag="9")]
-    pub spent_output_number: u64,
+    #[prost(uint32, tag="9")]
+    pub spent_output_number: u32,
     #[prost(double, tag="10")]
     pub value: f64,
     #[prost(string, tag="11")]
diff --git a/proto/bitcoin.proto b/proto/bitcoin.proto
index 3b2ac37..1feb782 100644
--- a/proto/bitcoin.proto
+++ b/proto/bitcoin.proto
@@ -78,7 +78,7 @@ message Input {
     uint32 index = 6;
     uint32 spent_block_height = 7;
     string spent_tx_id = 8;
-    uint64 spent_output_number = 9;
+    uint32 spent_output_number = 9;
     double value = 10;
     string address = 11;
     string type = 12;