diff --git a/test/fast/prover/pow-3-prover.js b/test/fast/prover/pow-3-prover.js
index 8704ad5d232179d3f633685509d38b3c6e593e0a..2fe82c9fdcf0232c04a1330ae7587cd25d352063 100644
--- a/test/fast/prover/pow-3-prover.js
+++ b/test/fast/prover/pow-3-prover.js
@@ -45,13 +45,13 @@ describe('PoW block prover', () => {
     const proof = yield prover.prove(block, 24, forcedTime)
     proof.should.containEql({
       version: 10,
-      nonce: 34000000000010,
+      nonce: 340000000000034,
       number: 35,
       time: 1,
       currency: '',
       issuer: 'HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd',
-      signature: 'iG9XEEIoGvCuFLRXqXIcGKFeK88K/A0J9MfKWAGvkRHtf6+VtMR/VDtPP67UzfnVdJb4QfMqrNsPMH2+7bTTAA==',
-      hash: '07573FEA1248562F47B1FA7DABDAF93C93B7328AA528F470B488249D5806F66D',
+      signature: 'E2sL6bFC9yOZSqBlSGYF158gsAXfJlWsHRHy1oVn3e7ZR6e6SXQ5Sq2fm1ex6Wv4BqO3n9qq0OHsxajUxshICg==',
+      hash: '03B176DE082DC451235763D4087305BBD01FD6B6C3248C74EF93B0839DFE9A05',
       parameters: '',
       previousHash: undefined,
       previousIssuer: undefined,
@@ -68,17 +68,17 @@ describe('PoW block prover', () => {
     });
   }));
 
-  it('should be able to use a prefix with 6 digits', () => co(function*(){
+  it('should be able to use a prefix maxed at 899', () => co(function*(){
     const block = {
       number: 1,
       issuer: 'HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd'
     }
-    const params = yield prover.changePoWPrefix('123456')
-    params.should.deepEqual({ prefix: '123456' })
+    const params = yield prover.changePoWPrefix('899')
+    params.should.deepEqual({ prefix: '899' })
     const forcedTime = 1;
     const proof = yield prover.prove(block, 1, forcedTime)
-    proof.nonce.should.equal(123456000000000000)
-    String(proof.nonce).should.have.length(18)
+    proof.nonce.should.equal(8990000000000001)
+    String(proof.nonce).should.have.length(16)
   }));
 
   it('should be able to stop a proof', () => co(function*(){