diff --git a/lib/preprocess.js b/lib/preprocess.js
index 9733a9ce..b7fdc519 100644
--- a/lib/preprocess.js
+++ b/lib/preprocess.js
@@ -59,6 +59,11 @@ const fetchMeasurements = async (web3Storage, cid) => {
 }
 
 export const parseParticipantAddress = filWalletAddress => {
+  // ETH addresses don't need any conversion
+  if (filWalletAddress.startsWith('0x')) {
+    return filWalletAddress
+  }
+
   if (!filWalletAddress || filWalletAddress.startsWith('f1') || filWalletAddress.startsWith('t1')) {
     // As a temporary fix to allow us to build & test the fraud detection pipeline,
     // we assign measurements from f1/t1 addresses to the same 0x participant.
diff --git a/test/preprocess.js b/test/preprocess.js
index aa53bc90..5202f0d4 100644
--- a/test/preprocess.js
+++ b/test/preprocess.js
@@ -86,4 +86,9 @@ describe('preprocess', () => {
     const converted = parseParticipantAddress('t17uoq6tp427uzv7fztkbsnn64iwotfrristwpryy')
     assert.strictEqual(converted, '0xf100Ac342b7DE48e5c89f7029624eE6c3Cde68aC')
   })
+
+  it('accepts ETH 0x address', () => {
+    const converted = parseParticipantAddress('0x3356fd7D01F001f5FdA3dc032e8bA14E54C2a1a1')
+    assert.strictEqual(converted, '0x3356fd7D01F001f5FdA3dc032e8bA14E54C2a1a1')
+  })
 })