diff --git a/lib/platform.browser.js b/lib/platform.browser.js
index 7b54d3e..28cd1e5 100644
--- a/lib/platform.browser.js
+++ b/lib/platform.browser.js
@@ -7,6 +7,7 @@
 // `hash.js` is already required by
 // `bitmessage -> eccrypto -> elliptic -> hash.js` so it won't add
 // additional bytes to the bundle.
+// See also: <https://github.com/indutny/elliptic/pull/26>.
 var hash = require("hash.js");
 // Use only one submodule from `sha.js` here and in worker because it's
 // faster. It will add additional bytes to the bundle but not that much
@@ -41,17 +42,16 @@ exports.randomBytes = function(size) {
 };
 
 // See `platform.js` for comments.
-var B64 = new BN("18446744073709551616");
+var B80 = new BN("1208925819614629174706176");
 exports.getTarget = function(opts) {
   var length = new BN(opts.payloadLength);
   length.iaddn(8);
   length.iaddn(opts.payloadLengthExtraBytes);
   var denominator = new BN(opts.ttl);
+  denominator.iaddn(65536);
   denominator.imul(length);
-  denominator.idivn(65536);
-  denominator.iadd(length);
   denominator.imul(new BN(opts.nonceTrialsPerByte));
-  var target = parseInt(B64.div(denominator).toString(16), 16);
+  var target = parseInt(B80.div(denominator).toString(16), 16);
   assert(target <= 9007199254740991, "Unsafe target");
   return target;
 };
diff --git a/lib/platform.js b/lib/platform.js
index 366597d..e277df6 100644
--- a/lib/platform.js
+++ b/lib/platform.js
@@ -33,24 +33,25 @@ exports.ripemd160 = function(buf) {
 
 exports.randomBytes = crypto.randomBytes;
 
-// 2^64.
-var B64 = bignum("18446744073709551616");
+// 2^80.
+var B80 = bignum("1208925819614629174706176");
 
 // NOTE(Kagami): We can't calculate entire target in JavaScript but the
 // result can be represented in native number type without losing
 // precision (targets mainly much less than 2^53).
 exports.getTarget = function(opts) {
-  // Calculate it bottom-up, right-to-left.
+  // Slightly rearrange calculations and compute it bottom-up,
+  // right-to-left. See also:
+  // <https://github.com/Bitmessage/PyBitmessage/issues/758>.
   var length = bignum(opts.payloadLength)
     // To account for the nonce which we will append later.
     .add(8)
     .add(opts.payloadLengthExtraBytes);
   var denominator = bignum(opts.ttl)
+    .add(65536)
     .mul(length)
-    .div(65536)
-    .add(length)
     .mul(opts.nonceTrialsPerByte);
-  var target = B64.div(denominator).toNumber();
+  var target = B80.div(denominator).toNumber();
   assert(target <= 9007199254740991, "Unsafe target");
   return target;
 };
diff --git a/test.js b/test.js
index 70fbd90..0024666 100644
--- a/test.js
+++ b/test.js
@@ -901,12 +901,12 @@ describe("WIF", function() {
 
 describe("POW", function() {
   it("should calculate target", function() {
-    expect(POW.getTarget({ttl: 2418984, payloadLength: 628, nonceTrialsPerByte: 1000, payloadLengthExtraBytes: 1000})).to.equal(297422593171);
-    expect(POW.getTarget({ttl: 86400, payloadLength: 628})).to.equal(4864647698763);
+    expect(POW.getTarget({ttl: 2418984, payloadLength: 628, nonceTrialsPerByte: 1000, payloadLengthExtraBytes: 1000})).to.equal(297422525267);
+    expect(POW.getTarget({ttl: 86400, payloadLength: 628})).to.equal(4863575534951);
   });
 
   it("should check a POW", function() {
-    expect(POW.check({nonce: 21997550, target: 297422593171, initialHash: Buffer("8ff2d685db89a0af2e3dbfd3f700ae96ef4d9a1eac72fd778bbb368c7510cddda349e03207e1c4965bd95c6f7265e8f1a481a08afab3874eaafb9ade09a10880", "hex")})).to.be.true;
+    expect(POW.check({nonce: 21997550, target: 297422525267, initialHash: Buffer("8ff2d685db89a0af2e3dbfd3f700ae96ef4d9a1eac72fd778bbb368c7510cddda349e03207e1c4965bd95c6f7265e8f1a481a08afab3874eaafb9ade09a10880", "hex")})).to.be.true;
     expect(POW.check({nonce: 3122437, target: 4864647698763, initialHash: Buffer("8ff2d685db89a0af2e3dbfd3f700ae96ef4d9a1eac72fd778bbb368c7510cddda349e03207e1c4965bd95c6f7265e8f1a481a08afab3874eaafb9ade09a10880", "hex")})).to.be.true;
     expect(POW.check({nonce: 3122436, target: 4864647698763, initialHash: Buffer("8ff2d685db89a0af2e3dbfd3f700ae96ef4d9a1eac72fd778bbb368c7510cddda349e03207e1c4965bd95c6f7265e8f1a481a08afab3874eaafb9ade09a10880", "hex")})).to.be.false;
   });
@@ -925,7 +925,7 @@ describe("POW", function() {
   if (allTests) {
     it("should do a POW", function() {
       this.timeout(300000);
-      var target = typeof window === "undefined" ? 297422593171 : 10693764680411;
+      var target = typeof window === "undefined" ? 297422525267 : 10688385392246;
       var initialHash = Buffer("8ff2d685db89a0af2e3dbfd3f700ae96ef4d9a1eac72fd778bbb368c7510cddda349e03207e1c4965bd95c6f7265e8f1a481a08afab3874eaafb9ade09a10880", "hex");
       return POW.doAsync({target: target, initialHash: initialHash})
       .then(function(nonce) {