diff --git a/Sources/Logging/Logging.swift b/Sources/Logging/Logging.swift
index e76c68b3..fec15160 100644
--- a/Sources/Logging/Logging.swift
+++ b/Sources/Logging/Logging.swift
@@ -917,7 +917,7 @@ public struct StreamLogHandler: LogHandler {
             : self.prettify(self.metadata.merging(metadata!, uniquingKeysWith: { _, new in new }))
 
         var stream = self.stream
-        stream.write("\(self.timestamp()) \(level) \(self.label) :\(prettyMetadata.map { " \($0)" } ?? "") \(message)\n")
+        stream.write("\(self.timestamp()) \(level) \(self.label) :\(prettyMetadata.map { " \($0)" } ?? "") [\(source)] \(message)\n")
     }
 
     private func prettify(_ metadata: Logger.Metadata) -> String? {
diff --git a/Tests/LoggingTests/LoggingTest.swift b/Tests/LoggingTests/LoggingTest.swift
index e1d2817f..f064fffa 100644
--- a/Tests/LoggingTests/LoggingTest.swift
+++ b/Tests/LoggingTests/LoggingTest.swift
@@ -669,12 +669,13 @@ class LoggingTest: XCTestCase {
         LoggingSystem.bootstrapInternal { _ in
             StreamLogHandler(label: label, stream: interceptStream)
         }
+        let source = "testSource"
         let log = Logger(label: label)
 
         let testString = "my message is better than yours"
-        log.critical("\(testString)")
+        log.critical("\(testString)", source: source)
 
-        let pattern = "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(\\+|-)\\d{4}\\s\(Logger.Level.critical)\\s\(label)\\s:\\s\(testString)$"
+        let pattern = "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(\\+|-)\\d{4}\\s\(Logger.Level.critical)\\s\(label)\\s:\\s\\[\(source)\\]\\s\(testString)$"
 
         let messageSucceeded = interceptStream.interceptedText?.trimmingCharacters(in: .whitespacesAndNewlines).range(of: pattern, options: .regularExpression) != nil
 
@@ -688,12 +689,13 @@ class LoggingTest: XCTestCase {
         LoggingSystem.bootstrapInternal { _ in
             StreamLogHandler(label: label, stream: interceptStream)
         }
+        let source = "testSource"
         let log = Logger(label: label)
 
         let testString = "my message is better than yours"
-        log.critical("\(testString)", metadata: ["test": "test"])
+        log.critical("\(testString)", metadata: ["test": "test"], source: source)
 
-        let pattern = "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(\\+|-)\\d{4}\\s\(Logger.Level.critical)\\s\(label)\\s:\\stest=test\\s\(testString)$"
+        let pattern = "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(\\+|-)\\d{4}\\s\(Logger.Level.critical)\\s\(label)\\s:\\stest=test\\s\\[\(source)\\]\\s\(testString)$"
 
         let messageSucceeded = interceptStream.interceptedText?.trimmingCharacters(in: .whitespacesAndNewlines).range(of: pattern, options: .regularExpression) != nil