diff --git a/src/api/common/schemas/quality.json b/src/api/common/schemas/quality.json
index 5123173a..47d0589f 100644
--- a/src/api/common/schemas/quality.json
+++ b/src/api/common/schemas/quality.json
@@ -1,8 +1,8 @@
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "title": "quality",
-  "description": "Ratio for incoming/outgoing transit fees represented in billionths. (For example, a value of 500 million represents a 0.5:1 ratio.) As a special case, 0 is treated as a 1:1 ratio.",
-  "type": "integer",
-  "minimum": 0,
-  "maximum": 1000000000
+  "description": "Ratio for incoming/outgoing transit fees.",
+  "type": "number",
+  "minimum": 0.000000001,
+  "maximum": 4.294967295
 }
diff --git a/src/api/ledger/parse/trustline.js b/src/api/ledger/parse/trustline.js
index 6704b6af..1a413e2f 100644
--- a/src/api/ledger/parse/trustline.js
+++ b/src/api/ledger/parse/trustline.js
@@ -3,6 +3,7 @@
 const assert = require('assert');
 const utils = require('./utils');
 const flags = utils.core.Transaction.flags.TrustSet;
+const BigNumber = require('bignumber.js');
 
 function parseFlag(flagsValue, trueValue, falseValue) {
   if (flagsValue & trueValue) {
@@ -14,6 +15,10 @@ function parseFlag(flagsValue, trueValue, falseValue) {
   return undefined;
 }
 
+function parseQuality(quality) {
+  return (new BigNumber(quality)).shift(-9).toNumber();
+}
+
 function parseTrustline(tx: Object): Object {
   assert(tx.TransactionType === 'TrustSet');
 
@@ -21,8 +26,8 @@ function parseTrustline(tx: Object): Object {
     limit: tx.LimitAmount.value,
     currency: tx.LimitAmount.currency,
     counterparty: tx.LimitAmount.issuer,
-    qualityIn: tx.QualityIn,
-    qualityOut: tx.QualityOut,
+    qualityIn: parseQuality(tx.QualityIn),
+    qualityOut: parseQuality(tx.QualityOut),
     ripplingDisabled: parseFlag(
       tx.Flags, flags.SetNoRipple, flags.ClearNoRipple),
     frozen: parseFlag(tx.Flags, flags.SetFreeze, flags.ClearFreeze),
diff --git a/src/api/transaction/trustline.js b/src/api/transaction/trustline.js
index 7ce374eb..235d92b3 100644
--- a/src/api/transaction/trustline.js
+++ b/src/api/transaction/trustline.js
@@ -3,6 +3,7 @@
 const utils = require('./utils');
 const validate = utils.common.validate;
 const Transaction = utils.common.core.Transaction;
+const BigNumber = require('bignumber.js');
 
 const TrustSetFlags = {
   authorized: {set: 'SetAuth'},
@@ -10,6 +11,10 @@ const TrustSetFlags = {
   frozen: {set: 'SetFreeze', unset: 'ClearFreeze'}
 };
 
+function convertQuality(quality) {
+  return (new BigNumber(quality)).shift(9).truncated().toNumber();
+}
+
 function createTrustlineTransaction(account, trustline) {
   validate.address(account);
   validate.trustline(trustline);
@@ -21,8 +26,8 @@ function createTrustlineTransaction(account, trustline) {
   };
 
   const transaction = new Transaction();
-  transaction.trustSet(account, limit,
-    trustline.qualityIn, trustline.qualityOut);
+  transaction.trustSet(account, limit, convertQuality(trustline.qualityIn),
+    convertQuality(trustline.qualityOut));
   utils.setTransactionBitFlags(transaction, trustline, TrustSetFlags);
   return transaction;
 }
diff --git a/test/fixtures/api/requests/prepare-trustline.json b/test/fixtures/api/requests/prepare-trustline.json
index 7a30b716..276e217d 100644
--- a/test/fixtures/api/requests/prepare-trustline.json
+++ b/test/fixtures/api/requests/prepare-trustline.json
@@ -2,8 +2,8 @@
   "currency": "USD",
   "counterparty": "rMH4UxPrbuMa1spCBR98hLLyNJp4d8p4tM",
   "limit": "10000",
-  "qualityIn": 500000000,
-  "qualityOut": 500000000,
+  "qualityIn": 0.91,
+  "qualityOut": 0.87,
   "ripplingDisabled": true,
   "frozen": false
 }
diff --git a/test/fixtures/api/responses/get-transaction-trustline-set.json b/test/fixtures/api/responses/get-transaction-trustline-set.json
index 826e7d7a..7a643ff7 100644
--- a/test/fixtures/api/responses/get-transaction-trustline-set.json
+++ b/test/fixtures/api/responses/get-transaction-trustline-set.json
@@ -7,8 +7,8 @@
     "limit": "10000",
     "currency": "USD",
     "counterparty": "rMH4UxPrbuMa1spCBR98hLLyNJp4d8p4tM",
-    "qualityIn": 500000000,
-    "qualityOut": 500000000,
+    "qualityIn": 0.5,
+    "qualityOut": 0.5,
     "ripplingDisabled": true
   },
   "outcome": {
diff --git a/test/fixtures/api/responses/prepare-trustline.json b/test/fixtures/api/responses/prepare-trustline.json
index 40106acb..0b138662 100644
--- a/test/fixtures/api/responses/prepare-trustline.json
+++ b/test/fixtures/api/responses/prepare-trustline.json
@@ -7,8 +7,8 @@
     "currency": "USD",
     "issuer": "rMH4UxPrbuMa1spCBR98hLLyNJp4d8p4tM"
   },
-  "QualityIn": 500000000,
-  "QualityOut": 500000000,
+  "QualityIn": 910000000,
+  "QualityOut": 870000000,
   "LastLedgerSequence": 8820051,
   "Fee": "12",
   "Sequence": 23