diff --git a/TransactionProcessor.BusinessLogic.Tests/Services/TransactionReceiptBuilderTests.cs b/TransactionProcessor.BusinessLogic.Tests/Services/TransactionReceiptBuilderTests.cs
index 5f9bdaa1..afa8dc62 100644
--- a/TransactionProcessor.BusinessLogic.Tests/Services/TransactionReceiptBuilderTests.cs
+++ b/TransactionProcessor.BusinessLogic.Tests/Services/TransactionReceiptBuilderTests.cs
@@ -31,7 +31,7 @@ public async Task TransactionReceiptBuilder_GetEmailReceiptMessage_MessageBuilt(
 
             var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>
                                                 {
-                                                    { $"{path}\\Receipts\\Email\\{transaction.OperatorIdentifier}\\TransactionAuthorised.html", new MockFileData("Transaction Number: [TransactionNumber]") }
+                                                    { $"{path}/Receipts/Email/{transaction.OperatorIdentifier}/TransactionAuthorised.html", new MockFileData("Transaction Number: [TransactionNumber]") }
                                                 });
 
             TransactionReceiptBuilder receiptBuilder = new TransactionReceiptBuilder(fileSystem);
diff --git a/TransactionProcessor.BusinessLogic/Services/TransactionReceiptBuilder.cs b/TransactionProcessor.BusinessLogic/Services/TransactionReceiptBuilder.cs
index a36656ac..76d50d98 100644
--- a/TransactionProcessor.BusinessLogic/Services/TransactionReceiptBuilder.cs
+++ b/TransactionProcessor.BusinessLogic/Services/TransactionReceiptBuilder.cs
@@ -52,7 +52,7 @@ public async Task<String> GetEmailReceiptMessage(Transaction transaction,
             IDirectoryInfo path = this.FileSystem.Directory.GetParent(Assembly.GetExecutingAssembly().Location);
 
             String fileData =
-                await this.FileSystem.File.ReadAllTextAsync($"{path}\\Receipts\\Email\\{transaction.OperatorIdentifier}\\TransactionAuthorised.html", cancellationToken);
+                await this.FileSystem.File.ReadAllTextAsync($"{path}/Receipts/Email/{transaction.OperatorIdentifier}/TransactionAuthorised.html", cancellationToken);
 
             PropertyInfo[] transactonProperties = transaction.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);